Growth, strain, and spin-orbit torques in epitaxial Ni-Mn-Sb films sputtered on GaAs

Zhao, Ning-Ning; Sud, A.; Sukegawa, Hiroaki; Komori, Sachio; Rogdakis, Konstantinos; Yamanoi, Kazuto; Patchett, J.; Robinson, Jason W. A.; Ciccarelli, Chiara; Kurebayashi, Hidekazu

doi:10.1103/physrevmaterials.5.014413

Cited by 6 publications

(1 citation statement)

References 53 publications

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“…The SOT in the half-Heusler NiMnSb depends strongly on the strain, which may be controlled by varying the substrate [11,12]. Notably, NiMnSb thin films sputtered on GaAs substrates yield SOT effective fields per applied current that are similar in magnitude to those in Pt/Co/AlO x magnetic bilayers [13]. Tetragonal strain adds Dresselhaus spin-orbit interaction (SOI) to the microscopic half-Heusler Hamiltonian, while shear strain supplements it with both Rashba and Dresselhaus SOI.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit torques in strained PtMnSb from first principles

Freimuth,

Blügel,

Mokrousov

2021

Preprint

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We compute spin-orbit torques (SOTs) in strained PtMnSb from first principles. We consider both tetragonal strain and shear strain. We find a strong linear dependence of the field-like SOTs on these strains, while the antidamping SOT is only moderately sensitive to shear strain and even insensitive to tetragonal strain. We also study the dependence of the SOT on the magnetization direction. In order to obtain analytical expressions suitable for fitting our numerical ab-initio results we derive a general expansion of the SOT in terms of all response tensors that are allowed by crystal symmetry. Our expansion includes also higher-order terms beyond the usually considered lowest order. We find that the dependence on the strain is much smaller for the higher-order terms than for the lowest order terms. In order to judge the sensitivity of the SOT on the exchange correlation potential we compute the SOT in both GGA and LDA. We find that the higher-order terms depend significantly on the exchange-correlation potential, while the lowest order terms are insensitive to it. Since the higher-order terms are small in comparison to the lowest order terms the total SOT is insensitive to the exchange correlation potential in strained PtMnSb.

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Section: Introductionmentioning

confidence: 99%

Spin-orbit torques in strained PtMnSb from first principles

Freimuth,

Blügel,

Mokrousov

2021

Preprint

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Extended Berry Curvature Tail in Ferromagnetic Weyl Semimetals NiMnSb and PtMnSb

Singh,

García‐Page,

Noky

et al. 2024

Advanced Science

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Heusler compounds belong to a large family of materials and exhibit numerous physical phenomena with promising applications, particularly ferromagnetic Weyl semimetals for their use in spintronics and memory devices. Here, anomalous Hall transport is reported in the room‐temperature ferromagnets NiMnSb (half‐metal with a Curie temperature (TC) of 660 K) and PtMnSb (pseudo half‐metal with a TC of 560 K). They exhibit 4 µB/f.u. magnetic moments and non‐trivial topological states. Moreover, NiMnSb and PtMnSb are the first half‐Heusler ferromagnets to be reported as Weyl semimetals, and they exhibit anomalous Hall conductivity (AHC) due to the extended tail of the Berry curvature in these systems. The experimentally measured AHC values at 2 K are 1.8 × 102 Ω−1 cm−1 for NiMnSb and 2.2 × 103 Ω−1 cm−1 for PtMnSb. The comparatively large value between them can be explained in terms of the spin‐orbit coupling strength. The combined approach of using ab initio calculations and a simple model shows that the Weyl nodes located far from the Fermi energy act as the driving mechanism for the intrinsic AHC. This contribution of topological features at higher energies can be generalized.

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Large Spin Hall Efficiency and Current‐Induced Magnetization Switching in Ferromagnetic Heusler Alloy Co₂MnAl‐Based Magnetic Trilayers

Wang,

Pan,

Xie

et al. 2024

Advanced Science

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The spin Hall efficiency (ξ) is a crucial parameter that evaluates the charge‐to‐spin conversion capability of a material, and thus materials with higher ξ are highly desirable in spin–orbit torque (SOT) devices. Recent studies have highlighted the use of ferromagnetic materials as robust spin sources, paving the way for the development of more efficient SOT devices. To accelerate this innovation, it is essential to pursue ferromagnetic materials of high ξ. Here the experimental observation of a large spin Hall efficiency is reported in ferromagnetic Heusler alloy Co2MnAl (CMA)‐based magnetic trilayers. Utilizing the current‐induced hysteresis loop shift technique, the spin Hall efficiency is determined to be 0.077 for the B2‐phase and 0.029 for the disordered CMA. Notably, magnetization switching both with and without the application of an external auxiliary magnetic field were achieved in these trilayers. The enhancement of ξ is attributed to the formation of chemical ordering in CMA. These findings provide new avenues for the development of ferromagnet‐based SOT devices.

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Growth, strain, and spin-orbit torques in epitaxial Ni-Mn-Sb films sputtered on GaAs

Cited by 6 publications

References 53 publications

Spin-orbit torques in strained PtMnSb from first principles

Spin-orbit torques in strained PtMnSb from first principles

Extended Berry Curvature Tail in Ferromagnetic Weyl Semimetals NiMnSb and PtMnSb

Large Spin Hall Efficiency and Current‐Induced Magnetization Switching in Ferromagnetic Heusler Alloy Co₂MnAl‐Based Magnetic Trilayers

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Growth, strain, and spin-orbit torques in epitaxial Ni-Mn-Sb films sputtered on GaAs

Cited by 6 publications

References 53 publications

Spin-orbit torques in strained PtMnSb from first principles

Spin-orbit torques in strained PtMnSb from first principles

Extended Berry Curvature Tail in Ferromagnetic Weyl Semimetals NiMnSb and PtMnSb

Large Spin Hall Efficiency and Current‐Induced Magnetization Switching in Ferromagnetic Heusler Alloy Co2MnAl‐Based Magnetic Trilayers

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Large Spin Hall Efficiency and Current‐Induced Magnetization Switching in Ferromagnetic Heusler Alloy Co₂MnAl‐Based Magnetic Trilayers