Detection of spin reversal and nutations through current measurements

TL;DR

This paper demonstrates how current measurements can detect spin reversal and nutations in a single spin system influenced by exchange coupling and bias voltage, revealing measurable effects and frequency transfer.

Contribution

It introduces a method to detect spin dynamics, including reversal and nutations, through current measurements in a ferromagnetic tunnel junction, highlighting new ways to probe spin behavior.

Findings

Bias voltage induces measurable spin reversal effects on current.

Harmonic bias voltage causes spin nutations detectable via current signals.

Double frequency components in current reveal spin dynamics.

Abstract

The dynamics of a single spin embedded in a the tunnel junction between ferromagnetic contacts is strongly affected by the exchange coupling to the tunneling electrons. Moment reversal of the local spin induced by the bias voltage across the junction is shown to have a measurable effect on the tunneling current. Furthermore, the frequency of a harmonic bias voltage is picked up by the local spin dynamics and transferred back to the current generating a double frequency component.