Spin-orbit effective fields in Pt/GdFeCo bilayers

TL;DR

This study investigates spin-orbit torque in Pt/GdFeCo bilayers, revealing a rapid increase in damping-like torque near the magnetization compensation temperature due to reduced net magnetic moment.

Contribution

It provides new insights into the temperature-dependent behavior of SOT in rare earth-transition metal ferrimagnetic alloys.

Findings

Damping-like torque increases near TM of GdFeCo.

Effective fields quantified via harmonic Hall measurements.

SOT behavior linked to net magnetic moment reduction.

Abstract

In the increasing interests on spin-orbit torque (SOT) with various magnetic materials, we investigated SOT in rare earth-transition metal ferrimagnetic alloys. The harmonic Hall measurements were performed in Pt/GdFeCo bilayers to quantify the effective fields resulting from the SOT. It is found that the damping-like torque rapidly increases near the magnetization compensation temperature TM of the GdFeCo, which is attributed to the reduction of the net magnetic moment.