Temperature dependent asymmetry of the nonlocal spin-injection resistance: evidence for spin non-conserving interface scattering

TL;DR

This study investigates how temperature influences spin injection resistance asymmetry in Co-Al2O3-Cu spin valves, revealing that interface spin scattering increases with temperature, affecting spin transport properties.

Contribution

It provides experimental evidence for temperature-dependent spin non-conserving interface scattering in nonlocal spin valves, highlighting the role of interface effects in spin transport.

Findings

Asymmetry in nonlocal resistance varies with temperature.

Evidence for increasing interface spin scattering at higher temperatures.

Supports the presence of a nonequilibrium resistance linked to magnetization orientation.

Abstract

We report nonlocal spin injection and detection experiments on mesoscopic Co-Al2O3-Cu spin valves. We have observed a temperature dependent asymmetry in the nonlocal resistance between parallel and antiparallel configurations of the magnetic injector and detector. This strongly supports the existence of a nonequilibrium resistance that depends on the relative orientation of the detector magnetization and the nonequilibrium magnetization in the normal metal providing evidence for increasing interface spin scattering with temperature.