Spin-Transfer Effects in Nanoscale Magnetic Tunnel Junctions

TL;DR

This paper investigates how spin-polarized currents can induce magnetic switching and precession in nanoscale magnetic tunnel junctions, revealing comparable current densities to metallic devices and demonstrating spin polarization at high voltages.

Contribution

It provides experimental evidence of spin-transfer effects in low-resistance magnetic tunnel junctions, expanding understanding of spin dynamics at the nanoscale.

Findings

Magnetic switching driven by spin-polarized currents observed.

Spin-transfer-driven switching occurs at voltages that quench tunnel magnetoresistance.

Current densities are similar to those in metallic spin-valve devices.

Abstract

We report measurements of magnetic switching and steady-state magnetic precession driven by spin-polarized currents in nanoscale magnetic tunnel junctions with low-resistance, < 5 Ohm-micron-squared, barriers. The current densities required for magnetic switching are similar to values for all-metallic spin-valve devices. In the tunnel junctions, spin-transfer-driven switching can occur at voltages that are high enough to quench the tunnel magnetoresistance, demonstrating that the current remains spin-polarized at these voltages.