Resonant Magnetization Switching Conditions of an Exchange-coupled Bilayer under Spin Wave Excitation

TL;DR

This paper explores the resonant conditions for magnetization switching in an exchange-coupled bilayer using spin wave excitation, revealing a specific resonance-dependent switching process with potential applications in multilevel data storage.

Contribution

It demonstrates that spin wave-assisted switching occurs only at specific resonant conditions related to PSSW modes, providing new insights into controlled magnetization switching mechanisms.

Findings

Switching occurs only at specific resonance conditions.

SWAS is distinct from conventional microwave switching.

Potential application in multilevel recording media.

Abstract

We systematically investigated the spin wave-assisted magnetization switching (SWAS) of a L10-FePt / Ni81Fe19 (Permalloy; Py) exchange-coupled bilayer using a pulse-like rf field (hrf) and mapped the switching events in the magnetic field (H) - hrf frequency (f) plane to reveal the switching conditions. The switching occurred only in a limited region following the dispersion relationship of the perpendicular standing spin wave (PSSW) modes in Py. The results indicate that SWAS is a resonant magnetization switching process, which is different from the conventional microwave assisted switching, and has the potential to be applied to selective switching for multilevel recording media.