Sub 100-ps dynamics of the anomalous Hall effect at THz frequencies

TL;DR

This paper investigates the ultrafast dynamics of the anomalous Hall effect in metallic alloys at terahertz frequencies, revealing sub-100 picosecond magnetization reversal and demonstrating potential for ultrafast spintronic control.

Contribution

It presents the first measurement of the terahertz anomalous Hall effect in 4f 3d alloys and links it to ultrafast magnetization dynamics, advancing spintronic technology.

Findings

Terahertz anomalous Hall effect observed in 4f 3d alloys.

Ultrafast sub-100 ps magnetization reversal demonstrated.

Control of spin-dependent currents at terahertz frequencies achieved.

Abstract

We report about the anomalous Hall effect in 4f 3d metallic alloys measured using terahertz time-domain spectroscopy. The strength of the observed terahertz spin-dependent transport phenomenon is in good agreement with expectations based on electronic transport measurements. Employing this effect, we succeeded to reveal ultrafast dynamics of the anomalous Hall effect which accompanies the sub-100 picosecond optically induced magnetization reversal in a GdFeCo alloy. The experiments demonstrate the ability to control currents at terahertz frequencies in spintronic devices magnetically and ultrafast.