Auto-oscillations and directional magnon emission induced by spin current injection into large magnetic volumes.

ABSTRACT: The ability to manipulate magnons using electronic currents holds transformative potential for high-frequency signal processing architectures based on insulating magnetic materials. A critical challenge, however, lies in achieving efficient magnon emission and amplification through damping compensation, which typically requires ultra-thin films. In this study, we break this limitation by demonstrating a three-order-of-magnitude increase in magnon population, consistent with the onset of auto-oscillations upon reaching damping compensation, by injecting a spin current from a μm-wide Pt wire into a continuous 150 nm-thick yttrium iron garnet film. Using nonlocal magnon transport and Brillouin light scattering, we reveal that damping compensation occurs due to magnon self-localization beneath

SUBMITTER: Schlitz R 

PROVIDER: S-EPMC12474986 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature