Damping and Anti-Damping Phenomena in Metallic Antiferromagnets: An ab-initio Study

Abstract

We report on a first principles study of anti-ferromagnetic resonance (AFMR) phenomena in metallic systems [MnX (X=Ir,Pt,Pd,Rh) and FeRh] under an external electric field. We demonstrate that the AFMR linewidth can be separated into a relativistic component originating from the angular momentum transfer between the collinear AFM subsystem and the crystal through the spin orbit coupling (SOC), and an exchange component that originates from the spin exchange between the two sublattices. The calculations reveal that the latter component becomes significant in the low temperature regime. Furthermore, we present results for the current-induced intersublattice torque which can be separated into the Field-Like (FL) and Damping-Like (DL) components, affecting the intersublattice exchange coupling and AFMR linewidth, respectively.

arXiv comment8 pages, 4 figures

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Cited by in corpus (11)

• Dynamics of domain walls motion driven by spin-orbit torque in antiferromagnets
• Nonlinear terahertz Néel spin-orbit torques in antiferromagnetic Mn${}_2$Au
• Proper dissipative torques in antiferromagnetic dynamics
• Atomic antiferromagnetic domain wall propagation beyond the relativistic limit
• Master equation approach to magnon relaxation and dephasing
• Magnon decay theory of Gilbert damping in metallic antiferromagnets
• Recent progress in antiferromagnetic dynamics
• Influence of non-local damping on magnon properties of ferromagnets
• Domain periodicity in an easy-plane antiferromagnet with Dzyaloshinskii-Moriya interaction
• Parametrically driven THz magnon-pairs: predictions towards ultimately fast and minimally dissipative switching
• Giant anisotropy of Gilbert damping in a Rashba honeycomb antiferromagnet