Abdelghani Laraoui

Abdelghani Laraoui

University of Nebraska-Lincoln

H-index: 19

North America-United States

Abdelghani Laraoui Information

University

University of Nebraska-Lincoln

Position

Assistant Professor at

Citations(all)

1369

Citations(since 2020)

812

Cited By

944

hIndex(all)

19

hIndex(since 2020)

15

i10Index(all)

23

i10Index(since 2020)

20

Email

University Profile Page

University of Nebraska-Lincoln

Abdelghani Laraoui Skills & Research Interests

Quantum materials

Magnetic nanomaterials

Quantum sensing

Nanophotonics

Quantum Optics

Top articles of Abdelghani Laraoui

Magnetic relaxometry study of cytochrome C using nitrogen vacancy centers in diamond

EE02. 00005: Magnetic relaxometry study of cytochrome C using nitrogen vacancy centers in diamond*

Authors

Abdelghani Laraoui,Suvechhya Lamichhane,Rupak Timalsina,Cody Schultz,Ilja Fescenko,Kapildeb Ambal,Sy-Hwang Liou,Rebecca Lai

Journal

Bulletin of the American Physical Society

Published Date

2024/3/5

Study of spin-wave propagation properties in ferrimagnetic insulator TmIG thin films

BB01. 00005: Study of spin-wave propagation properties in ferrimagnetic insulator TmIG thin films*

Authors

Abdelghani Laraoui,Rupak Timalsina,Haohan Wang,Bharat Giri,Adam Erickson,Xiaoshan Xu

Journal

Bulletin of the American Physical Society

Published Date

2024/3/4

Unraveling the formation dynamics of metallic femtosecond laser induced periodic surface structures

Femtosecond laser surface processing (FLSP) is an emerging fabrication technique to efficiently control the surface morphology of many types of materials including metals. However, the theoretical understanding of the FLSP formation dynamics is not a trivial task, since it involves the interaction of various physical processes (electromagnetic, thermal, fluid dynamics) and remains relatively unexplored. In this work, we tackle this problem and present rigorous theoretical results relevant to low-fluence FLSP that accurately match the outcomes of an experimental campaign focused on the formation dynamics of laser induced periodic surface structures (LIPSS) on stainless steel. More specifically, the topography and maximum depth of LIPSS trenches are theoretically and experimentally investigated as a function of the number of laser pulses. Moreover, precise LIPSS morphology measurements are performed using …

Authors

L Khosravi Khorashad,A Reicks,A Erickson,JE Shield,D Alexander,A Laraoui,G Gogos,C Zuhlke,C Argyropoulos

Journal

Optics & Laser Technology

Published Date

2024/4/1

Ferromagnetism and magnetic edge effects in Fe-implanted WS2 layers

Two-dimensional magnets are attracting great interest not only as a platform for new fundamental physics but also as a platform for applications in spintronic and optoelectronic devices [1]. Recent theoretical studies predicted the presence of ferromagnetism in transition metal dichalcogenide (TMD)[2]. One such TMD material is WS 2 which is shown to have weak ferromagnetic behavior [3]. Here, we experimentally demonstrate that the effect of Fe implantation in WS 2 has little to no effect on its ferromagnetism using nitrogen-vacancy (NV) diamond magnetometry [3]. We image the magnetic stray field produced by the WS 2 flakes (thickness= 2–50 nm), exfoliated from bulk substrates and transferred to the diamond side doped with NVs. We quantitatively analyze the spatially resolved induced magnetic field observations using COMSOL multiphysics magnetostatic simulation and find a good agreement with NV …

Authors

Abdelghani Laraoui,Thitinun Gas-osoth,Yifei Wang,Raman Kumar,Tom Delord,Adam Erickson,Tianlin Li,Cory Cress,Jose Fonseca-Vega,Xia Hong,Toshu An,Carlos Meriles,Suvechhya Lamichhane,Sy-Hwang Liou

Journal

Bulletin of the American Physical Society

Published Date

2024/3/4

Magnetic sensing of iron in cytochrome C using diamond quantum sensors

Iron is an essential yet toxic redox active element that is found in many cells, including neurons and glial cells. Several techniques have been used to quantify iron in neurons and cells; however, most are incapable of high-resolution imaging inside a single cell. Magnetic field sensors based on diamond nitrogen vacancy (NV) centers have emerged as a powerful tool for detecting magnetic signal in iron-containing biological samples with a good combination of spatial resolution and sensitivity. In this study we use NV based T1 relaxometry technique to map iron in cytochrome C (Cyt C) proteins. Cyt C plays an important role in the electron transport chain of mitochondria and it is in the Fe(III) paramagnetic state under ambient conditions. We measure Cyt C under different concentrations and locations of the 10-nm NV doped diamond chip. We show a reduction of the NV T1 from few milliseconds to hundreds of …

Authors

Suvechhya Lamichhane,Cody Schultz,Rupak Timalsina,Ilja Fescenko,Kapildeb Ambal,Sy-Hwang Liou,Rebecca Y Lai,Abdelghani Laraoui

Published Date

2024/3/13

Mapping of Spin‐Wave Transport in Thulium Iron Garnet Thin Films Using Diamond Quantum Microscopy

Spin waves, collective dynamic magnetic excitations, offer crucial insights into magnetic material properties. Rare‐earth iron garnets offer an ideal spin‐wave (SW) platform with long propagation length, short wavelength, gigahertz frequency, and applicability to magnon spintronic platforms. Of particular interest, thulium iron garnet (TmIG) has attracted huge interest recently due to its successful growth down to a few nanometers, observed topological Hall effect, and spin‐orbit torque‐induced switching effects. However, there is no direct spatial measurement of its SW properties. This work uses diamond nitrogen‐vacancy (NV) magnetometry in combination with SW electrical transmission spectroscopy to study SW transport properties in TmIG thin films. NV magnetometry allows probing spin waves at the sub‐micrometer scale, seen by the amplification of the local microwave magnetic field due to the coupling of NV …

Authors

Rupak Timalsina,Haohan Wang,Bharat Giri,Adam Erickson,Xiaoshan Xu,Abdelghani Laraoui

Journal

Advanced Electronic Materials

Published Date

2024/3

Studying the effect of boron doping and thickness on antiferromagnetic domains in epitaxial B-Cr2O3 films using diamond scanning probe microscopy

Y21. 00008: Studying the effect of boron doping and thickness on antiferromagnetic domains in epitaxial B-Cr 2 O 3 films using diamond scanning probe microscopy*

Authors

Abdelghani Laraoui,Adam Erickson,Ather Mahmood,Syed Qamar Abbas Shah,Ilja Fescenko,Christian Binek

Journal

Bulletin of the American Physical Society

Published Date

2024/3/8

Nitrogen-Vacancy Magnetic Relaxometry of Nanoclustered Cytochrome C Proteins

Nitrogen-vacancy (NV) magnetometry offers an alternative tool to detect paramagnetic centers in cells with a favorable combination of magnetic sensitivity and spatial resolution. Here, we employ NV magnetic relaxometry to detect cytochrome C (Cyt-C) nanoclusters. Cyt-C is a water-soluble protein that plays a vital role in the electron transport chain of mitochondria. Under ambient conditions, the heme group in Cyt-C remains in the Fe3+ state, which is paramagnetic. We vary the concentration of Cyt-C from 6 to 54 μM and observe a reduction of the NV spin–lattice relaxation time (T1) from 1.2 ms to 150 μs, which is attributed to the spin noise originating from the Fe3+ spins. NV T1 imaging of Cyt-C drop-casted on a nanostructured diamond chip allows us to detect the relaxation rates from the adsorbed Fe3+ within Cyt-C.

Authors

Suvechhya Lamichhane,Rupak Timalsina,Cody Schultz,Ilja Fescenko,Kapildeb Ambal,Sy-Hwang Liou,Rebecca Y Lai,Abdelghani Laraoui

Journal

Nano Letters

Published Date

2024/1/11

Room temperature direct imaging of topological spin textures in gradient-DMI engineered CoPt single layer

T23. 00006: Room temperature direct imaging of topological spin textures in gradient-DMI engineered CoPt single layer*

Authors

Abdelghani Laraoui,Adam Erickson,Qihan Zhang,Hamed Vakili,Ilja Fescenko,Edward Schwartz,Suvechhya Lamichhane,Sy-Hwang Liou,Alexey Kovalev,Jingsheng Chen

Journal

Bulletin of the American Physical Society

Published Date

2024/3/7

Nanoscale imaging of antiferromagnetic domains in epitaxial films of Cr 2 O 3 via scanning diamond magnetic probe microscopy

We report direct imaging of boundary magnetization associated with antiferromagnetic domains in magnetoelectric epitaxial Cr2O3 thin films using diamond nitrogen vacancy microscopy. We found a correlation between magnetic domain size and structural grain size which we associate with the domain formation process. We performed field cooling, i.e., cooling from above to below the Néel temperature in the presence of a magnetic field, which resulted in the selection of one of the two otherwise degenerate 180° domains. Lifting of such a degeneracy is achievable with a magnetic field alone due to the Zeeman energy of a weak parasitic magnetic moment in Cr2O3 films that originates from defects and the imbalance of the boundary magnetization of opposing interfaces. This boundary magnetization couples to the antiferromagnetic order parameter enabling selection of its orientation. Nanostructuring the Cr2O3 …

Authors

Adam Erickson,Syed Qamar Abbas Shah,Ather Mahmood,Ilja Fescenko,Rupak Timalsina,Christian Binek,Abdelghani Laraoui

Journal

RSC advances

Published Date

2023

Creating high-density NV- centers in CVD diamond using high-energy photons from Ar+ plasma

High-density Nitrogen-Vacancy (NV) centers in diamond are among the most versatile quantum sensors used in many sensing applications, including magnetic field sensors. The existing methods to create, such as high-density NV-centers, are expensive and cumbersome, often requiring a large dose of nitrogen implantation, degrading the quantum properties. The methods for the quick and efficient creation of NV-centers are still developing. In this talk, we present a novel and cost-effective approach to creating high-density NV-centers in a single crystal, CVD-grown diamond substrate with as-grown Nitrogen concentration< 1 ppm. We create a high-density NV-center by exposing the diamond substrate in Ar+ plasma for 30 s followed by two hours of thermal annealing at 1100 o C. Based on optically detected magnetic resonance and fluorescence microscopy measurements, we estimate an NV-density of~ 10 15 cm …

Authors

Kapildeb Ambal,Prem Karki,Rupak Timalsina,Mohammadjavad Dowran,Abdelghani Laraoui

Journal

APS March Meeting Abstracts

Published Date

2023

Detection of Iron in Nanoclustered Cytochrome C Proteins Using Nitrogen-Vacancy Magnetic Relaxometry

Nitrogen-vacancy (NV) magnetometry offers an alternative tool to detect iron levels in neurons and cells with a favorable combination of magnetic sensitivity and spatial resolution. Here we employ NV-T1 relaxometry to detect Fe in cytochrome C (Cyt-C) nanoclusters. Cyt-C is a water-soluble protein that contains a single heme group and plays a vital role in the electron transport chain of mitochondria. Under ambient conditions, the heme group remains in the Fe+3 paramagnetic state. We perform NV-T1 relaxometry on a functionalized diamond chip and vary the concentration of Cyt-C from 6 uM to 54 uM, resulting in a decrease of T1 from 1.2 ms to 150 us, respectively. This reduction is attributed to spin-noise originating from the intracellular Fe spins in the Cyt-C. We perform relaxometry imaging of Cyt-C proteins on a nanostructured diamond chip by varying the density of adsorbed iron from 1.44 x 10^6 to 1.7 x 10^7 per um^2.

Authors

Suvechhya Lamichhane,Rupak Timalsina,Cody Schultz,Ilja Fescenko,Kapildeb Ambal,Sy-Hwang Liou,Rebecca Y Lai,Abdelghani Laraoui

Journal

arXiv preprint arXiv:2310.08605

Published Date

2023/10/9

Studying the effect of boron doping and temperature on antiferromagnetic domains in epitaxial Cr2O3 films using diamond magnetometry

The antiferromagnetic (AFM) magnetoelectric chromia (Cr 2 O 3) is an archetypical oxide that permits voltage-control of the Néel vector in the presence of an applied magnetic field, but it suffers practical limitations due to its low Néel Temperature (T N)~ 307 K. Boron doping increases T N to 400 K and allows realizing voltage controlled Néel vector at zero magnetic field, a promising result for AFM spintronics. To date there is no direct measurement of T N in B-Cr 2 O 3, and it is not clear how doping affects its AFM properties. Here we use nitrogen vacancy (NV)-magnetometry to directly study the effect of B doping and temperature on the properties of AFM domains in 200-nm thick Cr 2 O 3 and B-Cr 2 O 3 films grown by pulsed laser deposition on AL 2 O 3 substrates. Magnetic contrast, domain size, domain width, and T N are compared for different temperatures, growth and interfacial conditions. By using reverse …

Authors

Abdelghani Laraoui,Adam Erickson,Ather Mahmood,Syed Qamar Abbas Shah,Ilja Fescenko,Rupak Timalsina,Christian Binek

Journal

Bulletin of the American Physical Society

Published Date

2023/3/8

Plasmon Enhanced Quantum Properties of Single Photon Emitters with Hybrid Hexagonal Boron Nitride Silver Nanocube Systems (Advanced Optical Materials 16/2023)

In article number 2300392, Abdelghani Laraoui and co-workers show that when single photon emitters in thin hexagonal boron nitride flakes are brought in contact with silver nanocubes, their quantum properties are enhanced due to plasmonic effects, manifested by a decrease in their excited state lifetime, a narrowing of their spectra, and an increase of their fluorescence.

Authors

Mohammadjavad Dowran,Andrew Butler,Suvechhya Lamichhane,Adam Erickson,Ufuk Kilic,Sy‐Hwang Liou,Christos Argyropoulos,Abdelghani Laraoui

Journal

Advanced Optical Materials

Published Date

2023/8

Enhancement of Single Photon Emitters in hexagonal boron nitride multilayered flakes Via Plasmonic Resonance in metallic nanostructures

Two dimensional (2D) materials such as hexagonal born nitride (hBN) have emerged as promising hosts of single photon sources (SPEs) which exhibits promising optical properties (high brightness, optically accessible spin states, high quantum efficiency, etc.), making them highly desirable elements for integrated quantum photonics. In this study, we create SPEs in thin (thickness<= 10 nm) hBN flakes deposited on a Si/SiO2 substrate by using a high-temperature (1100 C) annealing method under O 2 flow and characterize their quantum properties using a home-built confocal fluorescence microscope. We demonstrate plasmonic enhancement of SPE properties by spin-coating of 100 nm Ag nanotubes on top of the hBN flake: a decrease of emission linewidth by 30% and quantum emitter lifetime decrease by 60%. We expect> 2 order of magnitude enhancement of SPE fluorescence when integrating them to …

Authors

Abdelghani Laraoui,Mohammadjavad Dowran,Suvechhya Lamichhane,Adam Erickson,Andrew Butler,Sy-Hwang Liou,Christos Argyropoulos

Journal

APS March Meeting Abstracts

Published Date

2023

Nitrogen-vacancy magnetometry of individual Fe-triazole spin crossover nanorods

[Fe(Htrz)2(trz)](BF4) (Fe-triazole) spin crossover molecules show thermal, electrical, and optical switching between high spin (HS) and low spin (LS) states, making them promising candidates for molecular spintronics. The LS and HS transitions originate from the electronic configurations of Fe(II) and are considered to be diamagnetic and paramagnetic, respectively. The Fe(II) LS state has six paired electrons in the ground states with no interaction with the magnetic field and a diamagnetic behavior is usually observed. While the bulk magnetic properties of Fe-triazole compounds are widely studied by standard magnetometry techniques, their magnetic properties at the individual level are missing. Here we use nitrogen vacancy (NV) based magnetometry to study the magnetic properties of the Fe-triazole LS state of nanoparticle clusters and individual nanorods of size varying from 20 to 1000 nm. Scanning electron …

Authors

Suvechhya Lamichhane,Kayleigh A McElveen,Adam Erickson,Ilja Fescenko,Shuo Sun,Rupak Timalsina,Yinsheng Guo,Sy-Hwang Liou,Rebecca Y Lai,Abdelghani Laraoui

Journal

ACS nano

Published Date

2023/4/24

Studying spin states of single nano-rods of [Fe(Htrz)2(trz)](BF4) spin-crossover molecules using diamond quantum sensing microscopy

Spin crossover (SCO) molecules are one of the promising candidates for molecular electronics owing to its thermal, magnetic, and optical switching phenomena. Fe (Htrz) 2 (trz)](BF 4)] SCO polymers show thermal switching between high spin (HS) and low spin (LS) states which are applicable in the thermal sensors or switches. While the bulk magnetic properties of Fe (Htrz) 2 (trz)](BF 4)] molecules are widely studied by magnetometry techniques their properties at the individual level are missing. Here we use nitrogen vacancy (NV) based magnetometry to image individual Fe (II) triazole SCO nano-rods of size varying from 200 to 1000 nm. Scanning electron microscopy (SEM) and Raman spectroscopy are performed to find out the size of the Fe (II) triazole nano-rods and to confirm the spin state of the SCO molecule respectively. The stray magnetic fields produced by individual nano-rods are imaged by NV …

Authors

Abdelghani Laraoui,Suvechhya Lamichhane,Kayleigh McElveen,Adam Erickson,Shuo Sun,Rupak Timalsina,Yinsheng Guo,Rebecca Lai,Sy-Hwang Liou

Journal

APS March Meeting Abstracts

Published Date

2023

Correction: Nanoscale imaging of antiferromagnetic domains in epitaxial films of Cr 2 O 3 via scanning diamond magnetic probe microscopy

Correction for ‘Nanoscale imaging of antiferromagnetic domains in epitaxial films of Cr2O3 via scanning diamond magnetic probe microscopy’ by Adam Erickson et al., RSC Adv., 2023, 13, 178–185, https://doi.org/10.1039/D2RA06440E

Authors

Adam Erickson,Syed Qamar Abbas Shah,Ather Mahmood,Ilja Fescenko,Rupak Timalsina,Christian Binek,Abdelghani Laraoui

Journal

RSC advances

Published Date

2023

Excitation and detection of spin waves in rare-earth garnet insulator TmIG films using diamond nitrogen vacancy magnetometry

Study of spin waves, elementary excitations in magnetic materials, can be used as signal carriers in next generation electronic devices. Charge as degree of freedom in devices rather than electron for transferring and representing information eliminates heating effect due to current. Among the currently available techniques, we use ferromagnetic resonance (FMR) detection method to understand the magnetization dynamics, measure the damping, and detect magnon modes in ferrimagnetic insulator Thulium iron garnet (TmIG) films (thickness of 2-35 nm) made by pulsed laser deposition on gadolinium-gallium-garnet (GGG) substrates. We further use nitrogen-vacancy (NV) center in diamond based magnetometry to measure surface propagating spin waves at the sub-micron scale, seen by the amplification of the local microwave magnetic field due to coupling of NV spin with stray-field produced by the spin waves …

Authors

Abdelghani Laraoui,Rupak Timalsina,Haohan Haohanwang,Adam Erickson,Bharat Giri,Xiaoshan Xu

Journal

APS March Meeting Abstracts

Published Date

2023

Imaging voltage controlled antiferromagnetic domains' switching in B doped Cr2O3 epitaxial films using nitrogen-vacancy scanning microscopy

Antiferromagnetic (AFM) magnetoelectric chromia (Cr 2 O 3) allows voltage-control of the Néel vector in the presence of an applied magnetic field (H). Boron doping further allows the realization of voltage controlled Néel vector switching at zero H, a promising finding to AFM spintronics. B-doping is also believed to break the local symmetry allowing for the formation of polar nanoregions giving rise to transient polarization, and to in-plane 90 rotation of the Néel vector into a new stable state (vs 180 0 in undoped film). However, it is not clear how the voltage reversibly switches the Néel vector from in-plane to out-of-plane. In this study we use nitrogen vacancy (NV) scanning microscopy to image the surface/boundary magnetization in 200-nm thick B-Cr 2 O 3 films grown by pulsed laser deposition on Al 2 O 3 substrates. The acquired B NV images confirm the presence of homogeneously magnetized domains with …

Authors

Abdelghani Laraoui,Adam Erickson,Ather Mahmood,Syed Qamar Abbas Shah,Ilja Fescenko,Rupak Timalsina,Christian Binek

Journal

APS March Meeting Abstracts

Published Date

2023

An efficient method to create high-density nitrogen-vacancy centers in CVD diamond for sensing applications

Abstract The negatively charged Nitrogen-Vacancy (NV−) center in diamond is one of the most versatile and robust quantum sensors suitable for quantum technologies, including magnetic field and temperature sensors. For precision sensing applications, densely packed NV− centers within a small volume are preferable due to benefiting from 1/√ N sensitivity enhancement (N is the number of sensing NV centers) and efficient excitation of NV centers. However, methods for quickly and efficiently forming high concentrations of NV− centers are in the development stage. We report an efficient method for creating high-density NV− centers production from a relatively low nitrogen concentration based on high-energy photons generated from Ar+ plasma source. This study was done on type-IIa, single crystal, chemical vapor deposition (CVD)-grown diamond substrates with an as-grown nitrogen concentration of 1× 10 17 …

Authors

Prem Bahadur Karki,Rupak Timalsina,Mohammadjavad Dowran,Ayodimeji E Aregbesola,Abdelghani Laraoui,Kapildeb Ambal

Journal

Diamond and Related Materials

Published Date

2023/12/1

Magnetic sensing of iron in biomolecules using diamond nitrogen vacancy centers

Iron is an essential yet toxic redox active element that is found in many cells, including neurons and glial cells. Several techniques have been used to quantify iron in neurons and cells; however, most are incapable of high-resolution imaging inside a single cell. Magnetic field sensors based on diamond nitrogen vacancy (NV) centers have emerged as a powerful tool for detecting magnetic signal in iron-containing biological samples with a good combination of spatial resolution and sensitivity [1-3]. In this study we use NV based T 1 relaxometry technique [2] to map iron in cytochrome C (Cyt C) proteins. Cyt C plays an important role in the electron transport chain of mitochondria and it is in the Fe (III) paramagnetic state under ambient conditions. We measure Cyt C under different concentrations and locations of the 10-nm NV doped diamond chip. We show a reduction of the NV T 1 from few milliseconds to hundreds …

Authors

Rupak Timalsina,Cody Schultz,Suvechhya Lamichhane,Adam Erickson,Sy-Hwang Liou,Rebecca Lai,Abdelghani Laraoui

Journal

APS March Meeting Abstracts

Published Date

2022

Imaging boundary magnetization of antiferromagnetic domains in epitaxial films of magnetoelectric Cr2O3 via scanning diamond magnetic probe microscopy

We report direct imaging of boundary magnetization associated with antiferromagnetic domains in magnetoelectric epitaxial Cr2O3 thin films using diamond nitrogen vacancy microscopy. We found a correlation between magnetic domain size and structural grain size which we associate with the domain formation process. We performed field cooling, ie, cooling from above to below the Néel temperature in the presence of magnetic field, which resulted in the selection of one of the two otherwise degenerate 1800 domains. Lifting of such a degeneracy is achievable with a magnetic field alone due to the Zeeman energy of a weak parasitic magnetic moment in Cr2O3 films that originates from defects and the imbalance of the boundary magnetization of opposing interfaces. This boundary magnetization couples to the antiferromagnetic order parameter enabling selection of its orientation. Microstructuring the Cr2O3 film …

Authors

Adam Erickson,Ather Mahmood,Ilja Fescenko,Rupak Timalsina,Syed Qamar Abbas Sh,Christian Binek,Abdelghani Laraoui

Published Date

2022/9

Opportunities for nitrogen-vacancy-assisted magnetometry to study magnetism in 2D van der Waals magnets

Exploring and understanding magnetism in two-dimensional (2D) van der Waals (vdW) magnetic materials present a promising route for developing high-speed and low-power spintronics devices. Studying their magnetic properties at the nanoscale is challenging due to their low magnetic moment compared to bulk materials and the requirements of highly sensitive magnetic microscopy tools that work over a wide range of experimental conditions (eg, temperature, magnetic field, and sample geometry). This Perspective reviews the applications of nitrogen-vacancy center (NV) based magnetometry to study magnetism in 2D vdW magnets. The topics discussed include the basics, advantages, challenges, and the usage of NV magnetometry.

Authors

Abdelghani Laraoui,Kapildeb Ambal

Journal

Applied Physics Letters

Published Date

2022/8/8

Nansocale imaging of antiferromagnetic domains in epitaxial Cr2O3 films using diamond quantum sensing microscopy

Magnetic microscopy using nitrogen vacancy (NV) centers in diamond has become a versatile tool to study magnetic phenomena at the nanoscale [1]. In this study we use NV microscopy to map magnetic domains in antiferromagnetic (AFM) epitaxial Cr 2 O 3 films. Cr 2 O 3 thin films have been used to realize voltage-controlled AFM spintronics utilizing the peculiar boundary magnetization of single domains [2]. Boron doping can increase the Néel temperature of Cr 2 O 3 to above 400 K and allow Voltage controlled Néel vector 90 0-rotation in zero magnetic field [3]. We present a detailed investigation of magnetic domains configuration in pure 200-nm thick Cr 2 O 3 grown via pulsed laser deposition on Al 2 O 3. Our study shows unique magnetic-domain structures similar to the granular Cr 2 O 3 films [4]. We perform magnetic-field cooling measurements (heating above Néel temperature, then cooling under an …

Authors

Adam Erickson,Ather Mahmood,Syed Qamar Abbas Shah,Rupak Timalsina,Christian Binek,Abdelghani Laraoui

Published Date

2022

Imaging Néel Relaxation of Superparamagnetic Nanoparticles using Diamond Magnetic Microscopy

Widefield diamond magnetic microscopy using nitrogen-vacancy centers is an emerging technique in various fields, including the study of magnetic materials. Superparamagnetic iron-oxide nanoparticles (SPIONs) are of interest for biomedical imaging applications, many of which would benefit from characterizing SPION Néel relaxation times at the single-particle level. Here, we report progress on the use of diamond magnetic microscopy to study the magnetic relaxation dynamics of single SPIONs and characterize their heterogeneity.

Authors

Bryan Richards,Nate Ristoff,Abdelghani Laraoui,Ilja Fescenko,Joshua Damron,Nazanin Mosavian,Janis Smits,Andrey Jarmola,Pauli Kehayias,Maziar Saleh Ziabari,Andrew Mounce,Dale Huber,Victor Acosta

Journal

APS March Meeting Abstracts

Published Date

2022

Time-resolved diamond magnetic microscopy of superparamagnetic nanoparticles.

Introduction and Motivation Page 1 Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the US Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525. Unlimited Release SAND 21-XXXX Fall 2021 LDRD Virtual Poster Session Introduction and Motivation Nitrogen vacancy (NV) center Time-resolved diamond magnetic microscopy of superparamagnetic nanoparticles Authors: Nathaniel Ristoff (PhD Candidate in Physics), Victor Acosta (UNM), Dept of Physics, Sandia PI Name (Sandia, Org) Diamond Magnetic Microscopy of Malarial Hemozoin Nanocrystals, Fescenko et al., 2019 NV sensing applications • Squid neuron firing • Mapping ferromagnetism • Hemozoin magnetic properties • NV center NMR SAND2021-11409C …

Authors

Nathanial Ristoff,Victor Acosta

Published Date

2021/9/1

Method for inducing spin polarization in an analyte using 14N spin defect centers

A method of inducing spin polarization in an analyte is provided. The method exposes 14 N spin defect centers embedded within 25 nm of a diamond surface to a magnetic field while an analyte is near the surface. The 14 N spin defect centers are polarized by treatment with an electromagnetic wave protocol having a visible light pulse (p0); a microwave pulse (mw1), a radio frequency pulse (rf1), a microwave pulse (mw2) and a radio frequency pulse (rf2) resulting in polarization of the nuclear spins of the 14 N spin defect centers. Polarized spins in the 14 N spin defect centers induce spin polarization in the analyte.

Published Date

2020/7/28

Time resolved diamond magnetic microscopy of single transition metal magnetic nanoparticles

Understanding the magnetic properties of small transition metal magnetic nanoparticles (TMMNPs) can help in exploiting their useful properties such as high surface-to-volume ratio and tailorable surface chemistry for applications in catalysis, biosensing, and ultra-high-density magnetic recording. At size below 10 nm, surface effects play a major role in determining their magnetic properties. Symmetry breaking of the crystal structure at the particle surface, dangling bonds, and surface strain can alter their properties. Accurate measurements of magnetic properties of single TMMNPs would therefore shed light on their critical properties. However, measuring these properties of such small particles at ambient conditions presents a great challenge due to the lack of sensitivity of current nonperturbative magnetic imaging techniques. Here we show recent measurements using magnetic microscopy based on nitrogen …

Authors

Abdelghani Laraoui,Victor Acosta

Journal

Bulletin of the American Physical Society

Published Date

2020/3/2

Abdelghani Laraoui FAQs

What is Abdelghani Laraoui's h-index at University of Nebraska-Lincoln?

The h-index of Abdelghani Laraoui has been 15 since 2020 and 19 in total.

What are Abdelghani Laraoui's top articles?

The articles with the titles of

Magnetic relaxometry study of cytochrome C using nitrogen vacancy centers in diamond

Study of spin-wave propagation properties in ferrimagnetic insulator TmIG thin films

Unraveling the formation dynamics of metallic femtosecond laser induced periodic surface structures

Ferromagnetism and magnetic edge effects in Fe-implanted WS2 layers

Magnetic sensing of iron in cytochrome C using diamond quantum sensors

Mapping of Spin‐Wave Transport in Thulium Iron Garnet Thin Films Using Diamond Quantum Microscopy

Studying the effect of boron doping and thickness on antiferromagnetic domains in epitaxial B-Cr2O3 films using diamond scanning probe microscopy

Nitrogen-Vacancy Magnetic Relaxometry of Nanoclustered Cytochrome C Proteins

...

are the top articles of Abdelghani Laraoui at University of Nebraska-Lincoln.

What are Abdelghani Laraoui's research interests?

The research interests of Abdelghani Laraoui are: Quantum materials, Magnetic nanomaterials, Quantum sensing, Nanophotonics, Quantum Optics

What is Abdelghani Laraoui's total number of citations?

Abdelghani Laraoui has 1,369 citations in total.

What are the co-authors of Abdelghani Laraoui?

The co-authors of Abdelghani Laraoui are Jörg Wrachtrup, Burkard Hillebrands, Dirk Englund, Dmitry Budker, Andrei Slavin, S. R. J. Brueck.

    Co-Authors

    H-index: 111
    Jörg Wrachtrup

    Jörg Wrachtrup

    Universität Stuttgart

    H-index: 94
    Burkard Hillebrands

    Burkard Hillebrands

    Technische Universität Kaiserslautern

    H-index: 94
    Dirk Englund

    Dirk Englund

    Massachusetts Institute of Technology

    H-index: 81
    Dmitry Budker

    Dmitry Budker

    University of California, Berkeley

    H-index: 74
    Andrei Slavin

    Andrei Slavin

    Oakland University

    H-index: 72
    S. R. J. Brueck

    S. R. J. Brueck

    University of New Mexico

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