Spin Pumping Driven by Bistable Exchange Spin Waves

TL;DR

This paper demonstrates that spin pumping driven by bistable exchange spin waves in a Pt/Y3Fe5O12 film reveals strong coupling between exchange spin waves and spin currents, enabling exploration of nonlinear spin wave dynamics and bistability.

Contribution

It introduces a method to study nonlinear exchange spin wave dynamics via spin pumping and the inverse spin Hall effect in a Pt/Y3Fe5O12 system.

Findings

Selective enhancement of short-wavelength exchange spin waves via spin pumping.

Observation of unconventional bistability in exchange spin waves.

Direct access to nonlinear spin wave dynamics through parametric excitation.

Abstract

Spin pumping driven by bistable exchange spin waves is demonstrated in a Pt/Y$_3$Fe$_5$O$_{12}$ film under parametric excitation. In the Pt/Y$_3$Fe$_5$O$_{12}$ film, the spin pumping driven by parametric excitation selectively enhances the relaxation of short-wavelength exchange spin waves, indicating strong coupling between the exchange spin waves and spin currents at the interface through efficient spin transfer. The parametric spin pumping, furthermore, allows direct access to nonlinear spin wave dynamics in combination with the inverse spin Hall effect, revealing unconventional bistability of the exchange spin waves.