Hanle effect missing in a prototypical organic spintronic device

TL;DR

This study investigates the absence of the Hanle effect in a common organic spintronic device, highlighting the need for better understanding of spin injection and transport mechanisms.

Contribution

It reports the missing Hanle effect in a prototypical organic spintronic GMR device and discusses potential reasons for this absence.

Findings

Hanle effect not observed in measurements

Possible explanations include magnetization tilting, high mobility, or hot spots

Results suggest need for further understanding of spin transport

Abstract

We investigate spin precession (Hanle effect) in the prototypical organic spintronic giant magnetoresistance (GMR) device La0.7Sr0.3MnO3(LSMO)/tris(8-hydroxyquinoline)(Alq3)/AlOx/Co. The Hanle effect is not observed in measurements taken by sweeping a magnetic field at different angles from the plane of the device. As possible explanations we discuss the tilting out of plane of the magnetization of the electrodes, exceptionally high mobility or hot spots. Our results call for a greater understanding of spin injection and transport in such devices.