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arXiv · 1702.03779

Spin Pumping and Inverse Spin Hall Voltages from Dynamical Antiferromagnets

Øyvind Johansen·Arne Brataas
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Abstract

Dynamical antiferromagnets pump spins efficiently into adjacent conductors as ferromagnets. The high antiferromagnetic resonance frequencies represent a challenge for experimental detection, but magnetic fields can reduce these resonance frequencies. We compute the inverse spin Hall voltages resulting from dynamical spin excitations as a function of a magnetic field along the easy axis and the polarization of the driving AC magnetic field perpendicular to the easy axis. We consider the insulating antiferromagnets MnF$_2$, FeF$_2$, and NiO. Near the spin-flop transition, there is a significant enhancement of the DC spin pumping and inverse spin Hall voltage for the uniaxial antiferromagnets MnF$_2$ and FeF$_2$. In the biaxial NiO, the voltages are much weaker, and there is no spin-flop enhancement of the DC component.

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Øyvind Johansen, Arne Brataas. 2017-02-13. Spin Pumping and Inverse Spin Hall Voltages from Dynamical Antiferromagnets. https://doi.org/10.1103/physrevb.95.220408

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