Current-induced synchronized magnetization reversal of two-body Stoner particles with dipolar interaction

TL;DR

This paper studies how dipolar interactions influence the current-driven magnetization reversal in a two-particle system, revealing ways to reduce switching current and analyze synchronized dynamics for potential data storage applications.

Contribution

It provides analytical and numerical insights into how dipolar interactions affect switching current and synchronization in two-body Stoner particles, a novel approach for magnetic data manipulation.

Findings

Critical switching current $I_c$ decreases with dipolar interaction strength.

$I_c$ bifurcates at a critical DDI strength, reducing to about 70% of the non-interacting case.

Synchronization stability depends on DDI and current parameters.

Abstract

We investigate magnetization reversal of two-body uniaxial Stoner particles, by injecting spin-polarized current through a spin-valve structure. The two-body Stoner particles perform synchronized dynamics and can act as an information bit in computer technology. In the presence of magnetic dipole-dipole interaction (DDI) between the two particles, the critical switching current $I_c$ for reversing the two dipoles is analytically obtained and numerically verified in two typical geometric configurations. $I_c$ bifurcates at a critical DDI strength, where $I_c$ can be decreased to about 70% of the usual value without DDI. Moreover, we also numerically investigate the magnetic hysteresis loop, magnetization self-precession, reversal time and the synchronization stability phase diagram for the two-body system in the synchronized dynamics regime.