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Condensed Matter > Disordered Systems and Neural Networks
Title: Gilbert damping in two-dimensional metallic anti-ferromagnets
(Submitted on 27 Nov 2023 (v1), last revised 28 Mar 2024 (this version, v2))
Abstract: A finite spin life-time of conduction electrons may dominate Gilbert damping of two-dimensional metallic anti-ferromagnets or anti-ferromagnet/metal heterostructures. We investigate the Gilbert damping tensor for a typical low-energy model of a metallic anti-ferromagnet system with honeycomb magnetic lattice and Rashba spin-orbit coupling for conduction electrons. We distinguish three regimes of spin relaxation: exchange-dominated relaxation for weak spin-orbit coupling strength, Elliot-Yafet relaxation for moderate spin-orbit coupling, and Dyakonov-Perel relaxation for strong spin-orbit coupling. We show, however, that the latter regime takes place only for the in-plane Gilbert damping component. We also show that anisotropy of Gilbert damping persists for any finite spin-orbit interaction strength provided we consider no spatial variation of the N\'eel vector. Isotropic Gilbert damping is restored only if the electron spin-orbit length is larger than the magnon wavelength. Our theory applies to MnPS3 monolayer on Pt or to similar systems.
Submission history
From: Robert Sokolewicz [view email][v1] Mon, 27 Nov 2023 19:19:10 GMT (1301kb,D)
[v2] Thu, 28 Mar 2024 17:17:14 GMT (1178kb,D)
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