Spin Injection and Detection via the Anomalous Spin Hall Effect in a Ferromagnetic Metal

TL;DR

This paper introduces a new method for spin injection and detection using the anomalous spin Hall effect in ferromagnetic metals, demonstrating improved efficiency and tunability for spintronic devices.

Contribution

It presents the first experimental demonstration of using the anomalous spin Hall effect in ferromagnets for spin injection and detection, with tunable control via magnetization orientation.

Findings

Permalloy shows higher spin injection efficiency than platinum.

The anomalous spin Hall effect can be tuned by magnetization orientation.

Efficient magnon injection and detection achieved in a non-local geometry.

Abstract

We report a novel spin injection and detection mechanism via the anomalous Hall effect in a ferromagnetic metal. The anomalous spin Hall effect (ASHE) refers to the transverse spin current generated within the ferromagnet. We utilize the ASHE and its reciprocal effect to electrically inject and detect magnons in a magnetic insulator in a non-local geometry. Our experiments reveal that permalloy can have a higher spin injection and detection efficiency to that of platinum, owing to the ASHE. We also demonstrate the tunability of the ASHE via the orientation of the permalloy magnetization, thus creating new possibilities for spintronic applications.