Mode-Dependent Damping in Metallic Antiferromagnets Due to Inter-Sublattice Spin Pumping

Abstract

Damping in magnetization dynamics characterizes the dissipation of magnetic energy and is essential for improving the performance of spintronics-based devices. While the damping of ferromagnets has been well studied and can be artificially controlled in practice, the damping parameters of antiferromagnetic materials are nevertheless little known for their physical mechanisms or numerical values. Here we calculate the damping parameters in antiferromagnetic dynamics using the generalized scattering theory of magnetization dissipation combined with the first-principles transport computation. For the PtMn, IrMn, PdMn and FeMn metallic antiferromagnets, the damping coefficient associated with the motion of magnetization (${\alpha }_m$) is one to three orders of magnitude larger than the other damping coefficient associated with the variation of the Néel order (${\alpha }_n$), in sharp contrast to the assumptions made in the literature.

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• Gilbert damping phenomenology for two-sublattice magnets
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• Nonlinear terahertz Néel spin-orbit torques in antiferromagnetic Mn${}_2$Au
• Enhancement of ultrafast demagnetization rate and Gilbert damping driven by femtosecond laser-induced spin currents in Fe81Ga19/Ir20Mn80 bilayers
• Atomic antiferromagnetic domain wall propagation beyond the relativistic limit
• Master equation approach to magnon relaxation and dephasing
• Spin pumping at terahertz nutation resonances
• Magnon decay theory of Gilbert damping in metallic antiferromagnets
• Classification of Magnetic Forces on Antiferromagnetic Domain Wall
• Generation of spin-triplet Cooper pairs via a canted antiferromagnet
• Influence of inter-sublattice coupling on the terahertz nutation spin dynamics in antiferromagnets
• Cross-sublattice Spin Pumping and Magnon Level Attraction in van der Waals Antiferromagnets
• Reduced thermal stability of antiferromagnetic nanostructures
• Damping and Anti-Damping Phenomena in Metallic Antiferromagnets: An ab-initio Study
• Recent progress in antiferromagnetic dynamics
• Domain periodicity in an easy-plane antiferromagnet with Dzyaloshinskii-Moriya interaction
• Numerical Computation of Spin-Transfer Torques for Antiferromagnetic Domain walls
• Magnetic damping anisotropy in the two-dimensional van der Waals material Fe${}_3$GeTe${}_2$ from first principles
• Microscopic Calculation of Spin Torques in Textured Antiferromagnets
• Parametrically driven THz magnon-pairs: predictions towards ultimately fast and minimally dissipative switching
• Anomalies in the switching dynamics of C-type antiferromagnets and antiferromagnetic nanowires
• Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: A first-principles Floquet-nonequilibrium Green's function study
• Giant anisotropy of Gilbert damping in a Rashba honeycomb antiferromagnet
• Gilbert damping in two-dimensional metallic anti-ferromagnets