Enhancement of the magnetic interfacial exchange energy at a specific interface in NiFe/CoO/Co trilayer thin films via ion-beam modification

Cortie, David; Ting, Y. W; Chen, Pei-Shi; Tan, Xinxin; Lin, Ko‐Wei; Klose, F.

doi:10.1063/1.4865569

Cited by 16 publications

(8 citation statements)

References 24 publications

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“…1 f), we observe a qualitative transition in the shape of the MOKE hysteresis loop. While measurements conducted with relatively low pump fluence produce transient signals with sharp switching features, measurements taken at high pump fluences instead display two-step magnetization switching, suggesting different regions of the sample experience distinct coercive fields 27 , 28 . In the two-step hysteresis loops it is salient that one part narrows sharply, displaying a dramatically reduced coercivity of 33 Oe, while the remaining switching signal is comparatively resilient with a saturation field of approximately 430 Oe.…”

Section: Resultsmentioning

confidence: 97%

Ultrafast optical control of surface and bulk magnetism in magnetic topological insulator/antiferromagnet heterostructure

Liu

Eckberg

Pan

et al. 2022

Sci Rep

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Optical control of the magnetic properties in topological insulator systems is an important step in applying these materials in ultrafast optoelectronic and spintronic schemes. In this work, we report the experimental observation of photo-induced magnetization dynamics in the magnetically doped topological insulator (MTI)/antiferromagnet (AFM) heterostructure composed of Cr-(Bi,Sb)2Te3/CrSb. Through proximity coupling to the AFM layer, the MTI displays a dramatically enhanced magnetism, with robust perpendicular magnetic anisotropy. When subjected to intense laser irradiation, both surface and bulk magnetism of the MTI are weakened by laser-induced heating of the lattice, however, at the surface, the deleterious heat effect is compensated by the strengthening of Dirac-hole-mediated exchange coupling as demonstrated by an unconventional pump-fluence-dependent exchange-bias effect. Through theoretical analyses, the sizes of exchange coupling energies are estimated in the MTI/AFM bilayer structure. The fundamentally different mechanisms supporting the surface and bulk magnetic order in MTIs allow a novel and distinctive photo-induced transient magnetic state with antiparallel spin configuration, which broadens the understanding of the magnetization dynamics of MTIs under ultrashort and intense optical excitation.

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Section: Resultsmentioning

confidence: 97%

Ultrafast optical control of surface and bulk magnetism in magnetic topological insulator/antiferromagnet heterostructure

Liu

Eckberg

Pan

et al. 2022

Sci Rep

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show abstract

“…While measurements conducted with relatively low pump uence produce transient signals with sharp switching features, measurements taken at high pump uences instead display two-step magnetization switching, suggesting different regions of the sample experience distinct coercive elds. [23,24] In the two-step hysteresis loops it is salient that one part narrows sharply, displaying a dramatically reduced coercivity of 33 Oe, while the remaining switching signal is comparatively resilient with a saturation eld of approximately 430 Oe. Such a dynamical magnetic structure is analogous to a spin-valve-like "hard-soft" bilayer set.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Optical Control of Surface and Bulk Magnetism in Magnetic Topological Insulator/Antiferromagnet Heterostructure

Liu

Eckberg

Pan

et al. 2022

Preprint

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Optical control of the magnetic properties in topological insulator systems is an important step in applying these materials in ultrafast optoelectronic and spintronic schemes. In this work, we report the experimental observation of photo-induced magnetization dynamics in the magnetically doped topological insulator (MTI)/antiferromagnet (AFM) heterostructure composed of Cr-(Bi,Sb)2Te3/CrSb. Through proximity coupling to the AFM layer, the MTI displays a dramatically enhanced magnetism, with robust perpendicular magnetic anisotropy. When subjected to intense laser irradiation, magnetism in the bulk of the MTI is strikingly weakened by laser-induced heating of the lattice, whereas the surface magnetism is enhanced due to the strengthening Dirac-hole-mediated exchange coupling as demonstrated by an unconventional pump-fluence-dependent exchange-bias effect. Through theoretical analyses, the sizes of exchange coupling energies are estimated in the MTI/AFM bilayer structure. The fundamentally different mechanisms supporting the surface and bulk magnetic order in MTIs allow a novel and distinctive photo-induced transient magnetic state with antiparallel spin configuration, which broadens the understanding of the magnetization dynamics of MTIs under ultrashort and intense optical excitation.

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“…The structural depth profile of the layered sample is encoded in the reflectivity as a function of the scattering vector Q. PNR experiments were performed on the time-of-flight PLATYPUS reflectometer at the OPAL Research Reactor, Australia. 15,21,[29][30][31] The PNR samples were field-cooled in 10 kOe from 310 K to 110 K, and the spin-dependent neutron reflectivity channels R + and R − were measured at 110 K and upon warming to 310 K. The difference between the R + and R − reflectivity channels gives the spin asymmetry SA = (R + − R − )/(R + + R − ) of a sample as a function of the scattering vector Q. The depth-dependence of the sample's in-plane magnetic moment is encoded in the Q-dependence of the SA data.…”

Section: Experimental Methodsmentioning

confidence: 99%

Surface engineering with Ar+/O2+ ion beam bombardment: Tuning the electronic and magnetic behavior of Ni80Fe20/La0.7Sr0.3MnO3/SrTiO3(001) junctions

Bergenti

Manna

Lin

et al. 2018

Journal of Applied Physics

Self Cite

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The magnetic and magnetotransport properties of Ni80Fe20/La0.7Sr0.3MnO3 (NiFe/LSMO) bilayers were investigated after bombarding the LSMO surface with low-energy Ar+ or O2+/Ar+ ion beams before the growth of the top NiFe layer. A variety of magnetic properties are revealed, including an asymmetric twostepped hysteresis loop with an exchange bias loop shift, and alternatively, a symmetric two-stepped hysteresis loop with an enhanced coercivity. Polarized neutron reflectometry measurements provide details of the magnetic depth profile and interface layer magnetism at different temperatures. The LSMO surface modifications determine a complex magnetic and electric NiFe/LSMO interface having a strong effect on the magnetoresistance of the bilayer. Surface engineering based on ion beam bombardment is presented as a promising technique for optimizing the electronic and magnetic properties of NiFe/LSMO junctions for future device applications.

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Enhancement of the magnetic interfacial exchange energy at a specific interface in NiFe/CoO/Co trilayer thin films via ion-beam modification

Abstract: Enhancement of the magnetic interfacial exchange energy at a specific interface Enhancement of the magnetic interfacial exchange energy at a specific interface in NiFe/CoO/Co trilayer thin films via ion-beam modification in NiFe/CoO/Co trilayer thin films via ion-beam modification

Cited by 16 publications

References 24 publications

Ultrafast optical control of surface and bulk magnetism in magnetic topological insulator/antiferromagnet heterostructure

Ultrafast optical control of surface and bulk magnetism in magnetic topological insulator/antiferromagnet heterostructure

Ultrafast Optical Control of Surface and Bulk Magnetism in Magnetic Topological Insulator/Antiferromagnet Heterostructure

Surface engineering with Ar+/O2+ ion beam bombardment: Tuning the electronic and magnetic behavior of Ni80Fe20/La0.7Sr0.3MnO3/SrTiO3(001) junctions

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