Spin-Wave versus Joule Heating in Spin-Hall-Effect/Spin-Transfer-Torque Driven Cr/Heusler/Pt Waveguides

TL;DR

This study investigates how DC currents influence magnetization dynamics in Cr/Heusler/Pt waveguides, revealing effects of spin-transfer torque on spin-wave damping and frequency shifts, with implications for understanding heating mechanisms.

Contribution

The paper provides a time-resolved analysis of spin-wave behavior under DC currents, highlighting the impact of spin-transfer torque on damping and frequency in a specific waveguide structure.

Findings

Spin-transfer torque reduces effective spin-wave damping.

DC current increases magnon density significantly.

Frequency shifts are linked to spin-transfer effects.

Abstract

We present a time-resolved study of the DC-current driven magnetization dynamics in a microstructured Cr/Heusler/Pt waveguide by means of Brillouin light scattering. A reduction of the effective spin-wave damping via the spin-transfer-torque effect leads to a strong increase in the magnon density. This is accompanied by a decrease of the spin-wave frequencies. By evaluating the time scales of these effects, the origin of this frequency shift can be identified. However, recently, we found that the experimental setup partially influences the decay of the spin-wave intensity after the current pulse is switched off. Thus, further investigations on the presented effect are needed to allow for a more detailed analysis. For this reason, we need to withdraw the manuscript at this point and might publish an updated version later.