Dynamic Feedback in Ferromagnet/Spin Hall Metal Heterostructures

Abstract

In ferromagnet/normal metal heterostructures, spin pumping and spin-transfer torques are two reciprocal processes that occur concomitantly. Their interplay introduces a dynamic feedback effect interconnecting energy dissipation channels of both magnetization and current. By solving the spin diffusion process in the presence of the spin Hall effect in the normal metal, we show that the dynamic feedback gives rise to: (i) a nonlinear magnetic damping that is crucial to sustain uniform steady-state oscillations of a spin Hall oscillator at large angles. (ii) a frequency dependent spin Hall magnetoimpedance that reduces to the spin Hall magnetoresistance in the dc limit.

4.5 pages, 2 figures

References in corpus (4)

• Theory of spin Hall magnetoresistance
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Ultrafast Switching of Antiferromagnets via Spin-transfer Torque
• Current-induced spin torque resonance of magnetic insulators

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• Spin Nernst Effect of Antiferromagnetic Magnons in the Presence of Spin Diffusion
• Characterizing Spin-Orbit Torques by Tensorial Spin Hall Magnetoresistance