Quasi ballistic magnetization reversal

TL;DR

This paper demonstrates ultra-fast quasi ballistic magnetization reversal in a microscopic spin valve, achieving reversal times as short as 165 ps through controlled magnetic field pulses, advancing the fundamental limits of magnetic switching speed.

Contribution

It introduces a novel quasi ballistic switching method for magnetization reversal, reaching the fundamental ultra-fast limit with precise control of magnetic field pulses.

Findings

Reversal times as short as 165 ps achieved.

Controlled 180-degree precession leads to magnetization reversal.

Demonstrates the fundamental ultra-fast limit of field-induced switching.

Abstract

We demonstrate a quasi ballistic switching of the magnetization in a microscopic mag-neto resistive memory cell. By means of time resolved magneto transport we follow the large angle precession of the free layer magnetization of a spin valve cell upon applica-tion of transverse magnetic field pulses. Stopping the field pulse after a 180 degree precession rotation leads to magnetization reversal with reversal times as short as 165 ps. This switching mode represents the fundamental ultra fast limit of field induced magnetization reversal.