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Spin-orbit torques in a Rashba honeycomb antiferromagnet
Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands.
King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, Thuwal 23955, Saudi Arabia;Forschungszentrum Julich, Peter Grunberg Inst, D-52425 Julich, Germany.ORCID iD: 0000-0001-9139-7741
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Skolkovo Inst Sci & Technol, Moscow 121205, Russia.
King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, Thuwal 23955, Saudi Arabia.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 21, article id 214403Article in journal (Refereed) Published
Abstract [en]

Recent experiments on switching antiferromagnetic domains by electric current pulses have attracted a lot of attention to spin-orbit torques in antiferromagnets. In this work, we employ the tight-binding model solver, kwant, to compute spin-orbit torques in a two-dimensional antiferromagnet on a honeycomb lattice with strong spin-orbit interaction of Rashba type. Our model combines spin-orbit interaction, local s-d-like exchange, and scattering of conduction electrons on on-site disorder potential to provide a microscopic mechanism for angular-momentum relaxation. We consider two versions of the model: One with preserved and one with broken sublattice symmetry. A nonequilibrium staggered polarization that is responsible for the so-called Neel spin-orbit torque is shown to vanish identically in the symmetric model but may become finite if sublattice symmetry is broken. Similarly, antidamping spin-orbit torques vanish in the symmetric model but become finite and anisotropic in a model with broken sublattice symmetry. As expected, antidamping torques also reveal a sizable dependence on impurity concentration. Our numerical analysis also confirms symmetry classification of spin-orbit torques and strong torque anisotropy due to in-plane confinement of electron momenta.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 21, article id 214403
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-400671DOI: 10.1103/PhysRevB.100.214403ISI: 000499970900003OAI: oai:DiVA.org:uu-400671DiVA, id: diva2:1382297
Funder
Swedish Research Council, 2018-04383Available from: 2020-01-02 Created: 2020-01-02 Last updated: 2020-01-02Bibliographically approved

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Yudin, Dmitry

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