Spin-orbit torques in strained PtMnSb from first principles
Freimuth F, Bluegel S, Mokrousov Y (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 103
Article Number: 224414
Journal Issue: 22
DOI: 10.1103/PhysRevB.103.224414
Abstract
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 to 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.
Involved external institutions
Germany (DE)How to cite
APA:
Freimuth, F., Bluegel, S., & Mokrousov, Y. (2021). Spin-orbit torques in strained PtMnSb from first principles. Physical Review B, 103(22). https://doi.org/10.1103/PhysRevB.103.224414
MLA:
Freimuth, Frank, Stefan Bluegel, and Yuriy Mokrousov. "Spin-orbit torques in strained PtMnSb from first principles." Physical Review B 103.22 (2021).
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