Gilbert damping in two-dimensional metallic antiferromagnets

• A finite spin life-time of conduction electrons may dominate Gilbert damping of two-dimensional metallic antiferromagnets or antiferromagnet / metal heterostructures. We investigate the Gilbert damping tensor for a typical low-energy model of a metallic antiferromagnet system with honeycomb magnetic lattice and Rashba spinorbit 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 & eacute;el vector. Isotropic Gilbert damping is restored only if the electron spin -orbit length is larger than the magnon wavelength. Our theory applies to MnPS 3 monolayer on Pt or to similar systems.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)