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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Cited by in corpus (4)

• Cross-sublattice Spin Pumping and Magnon Level Attraction in van der Waals Antiferromagnets
• Damping and Anti-Damping Phenomena in Metallic Antiferromagnets: An ab-initio Study
• Recent progress in antiferromagnetic dynamics
• Magnetic damping anisotropy in the two-dimensional van der Waals material Fe${}_3$GeTe${}_2$ from first principles