Spin pumping at terahertz nutation resonances

TL;DR

This paper explores how nutation resonances in ferromagnets and antiferromagnets influence spin pumping into adjacent metals, revealing unique signatures and behaviors that differ from normal precession modes.

Contribution

It demonstrates that nutation resonances produce a spin current with opposite sign and distinct ratios compared to precession, especially in antiferromagnets, offering new experimental insights.

Findings

Nutation resonance spin current can be opposite in sign to precession.

The ratio of spin currents at nutation and precession resonances is more pronounced in antiferromagnets.

Nutation modes are dominated by sublattice precession, with a reversal of precession sense.

Abstract

We investigate spin pumping current injected by the nutation resonances of a ferromagnet or an antiferromagnet into an adjacent metal. Comparing the dc spin pumping current between the normal precession and nutation resonances, we find that the ratio of spin pumping current at the nutation resonance to the precession resonance is more pronounced in antiferromagnets. We further show that the spin pumping current injected by the nutation resonance is opposite in sign as compared to the normal precession mode. This could offer a useful experimental signature for identifying such nutation resonances. Analyzing the nature of the nutational eigenmodes, we show that the sign change in spin current is rooted in a reversal of the precession sense for the nutation mode(s). Furthermore, the nutational modes in antiferromagnets are found to be dominated by precession of one of the two sublattices only.