Theory of spin-Hall magnetoresistance in the AC (terahertz) regime

Abstract

In bilayers consisting of a normal metal (N) with spin-orbit coupling and a ferromagnet (F), the combination of the spin-Hall effect, the spin-transfer torque, and the inverse spin-Hall effect gives a small correction to the in-plane conductivity of N, which is referred to as spin-Hall magnetoresistance (SMR). We here present a theory of the SMR and the associated off-diagonal conductivity corrections for frequencies up to the terahertz regime. We show that the SMR signal has pronounced singularities at the spin-wave frequencies of F, which identifies it as a potential tool for all-electric spectroscopy of magnon modes. A systematic change of the magnitude of the SMR at lower frequencies is associated with the onset of a longitudinal magnonic contribution to spin transport across the F-N interface.

21 pages, 9 figures

References in corpus (14)

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Cited by in corpus (7)

• Spintronic Sources of Ultrashort Terahertz Electromagnetic Pulses
• Controlling the orbital Hall effect in gapped bilayer graphene in the terahertz regime
• Probing magnetic anisotropy and spin-reorientation transition in 3D antiferromagnet, Ho${}_{0.5}$Dy${}_{0.5}$FeO${}_3|$Pt using spin Hall magnetoresistance
• Finite-frequency spin conductance of a ferro-/ferrimagnetic-insulator|normal-metal interface
• Spin Hall magnetoresistance at the altermagnetic insulator/Pt interface
• Magnon-mediated electric current drag and nonlocal spin-Peltier effect in the ac regime
• Theory of nonlinear magnetoelectric transport effects in normal-metal $-$ magnetic-insulator heterostructures