Resistance noise in spin valves

TL;DR

This paper investigates how magnetization fluctuations in spin valves induce resistance noise, revealing that the noise level varies significantly with magnetic configuration and can surpass previous expectations, aligning with recent experiments.

Contribution

It demonstrates the impact of magnetization fluctuations and exchange interactions on resistance noise, providing a theoretical explanation consistent with experimental observations.

Findings

Resistance noise depends strongly on magnetic configuration.

Antiparallel configuration can have noise levels ten times higher than parallel.

Theoretical results agree with recent experimental data.

Abstract

Fluctuations of the magnetization in spin valves are shown to cause resistance noise that strongly depends on the magnetic configuration. Due to the applied external field and the dynamic exchange interaction through the normal metal spacer, the electrical noise level of the antiparallel configuration can exceed that of the parallel one by an order of magnitude, in agreement with recent experimental results.