Measurement of magnetic field induced by spin-accumulated electrons in a FeCoB nanomagnet

TL;DR

This study measures the magnetic field generated by spin accumulation at a nanomagnet boundary, revealing its potential to influence magnetization reversal and optimize MRAM recording efficiency.

Contribution

A novel high-precession measurement method for spin-accumulation-induced magnetic fields in nanomagnets is developed and applied to FeCoB nanomagnets.

Findings

Magnetic field of about 20 Gauss measured at the nanomagnet boundary.

Spin-accumulation-induced magnetic field can reverse magnetization under resonance conditions.

Method enables detailed study of spin-induced magnetic effects in nanomagnets.

Abstract

The spins, which are accumulated at a boundary of a nanomagnet due to the Spin Hall effect, induce a magnetic field, which tilts the nanomagnet magnetization out of its easy axis. Even though this magnetic field is relatively small (about 20 Gauss), it can reverse the magnetization of the nanomagnet if it is modulated in resonance with the magnetization precession and the conditions of the parametric resonance are met. Therefore, such magnetic field can be used to optimize the recording mechanism and to minimize the recording energy for MRAM. A high-precession measurement method of the spin-accumulation-induced magnetic field is developed. The magnetic field is measured in a FeCoB nanomagnet and its properties are studied.