Switching the magnetization of magnetostrictive nanomagnets from single-domain to non-volatile vortex states with a surface acoustic wave

TL;DR

This study demonstrates how surface acoustic waves can switch magnetostrictive nanomagnets from a single-domain to a non-volatile vortex state, offering a potential energy-efficient method for magnetic state control.

Contribution

It introduces a novel technique using surface acoustic waves to induce non-volatile vortex states in magnetostrictive nanomagnets, supported by micromagnetic modeling.

Findings

Nanomagnets switch from single-domain to vortex states under SAWs.

Vortex states are stable until reset by a magnetic field.

Method offers a pathway for energy-efficient magnetic switching.

Abstract

We report manipulation of the magnetic states of elliptical cobalt magnetostrictive nanomagnets (of nominal dimensions ~ 340 nm x 270 nm x 12 nm) delineated on bulk 128{\deg} Y-cut lithium niobate with Surface Acoustic Waves (SAWs) launched from interdigitated electrodes. Isolated nanomagnets that are initially magnetized to a single domain state with magnetization pointing along the major axis of the ellipse are driven into a vortex state by surface acoustic waves that modulate the stress anisotropy of these nanomagnets. The nanomagnets remain in the vortex state until they are reset by a strong magnetic field to the initial single domain state, making the vortex state non-volatile. This phenomenon is modeled and explained using a micromagnetic framework and could lead to the development of extremely energy efficient magnetization switching methodologies.