Mechanically-Assisted Current-Induced Switching of the Magnetic Moment in a Torsional Oscillator

TL;DR

This paper explores how torsional oscillations influence current-induced magnetic switching in a nanomagnet, revealing that mechanical motion can assist or inhibit switching, with potential advantages for device applications.

Contribution

It introduces a modified model incorporating torsional oscillations into magnetic switching, analyzing three regimes and providing phase diagrams for parameter ranges.

Findings

Switching is possible with torsional oscillations alone.

Torsional oscillations can assist or inhibit switching depending on parameters.

Mechanical torsion may offer advantages in magnetic device control.

Abstract

Switching of the direction of the magnetic moment in a nanomagnet is studied within a modified Slonczewski's model that permits torsional oscillations of the magnet. We show that the latter may inhibit or assist the magnetization switching, depending on parameters. Three regimes have been studied: the switching by torsional oscillations alone, the switching by the spin-polarized current with torsional oscillations permitted, and the magnetization switching by the current combined with the mechanical twist. We show that switching of the magnetic moment is possible in all three cases and that allowing torsional oscillations of the magnet may have certain advantages for applications. Phase diagrams are computed that show the range of parameters required for the switching.