Control of Propagating Spin Waves via Spin Transfer Torque in a Metallic Bilayer Waveguide

TL;DR

This paper demonstrates electrical control of propagating spin waves in a CoFeB/Ta bilayer, showing attenuation or amplification depending on current direction, with potential applications in nano-oscillators and information processing.

Contribution

It introduces a method to control spin wave propagation electrically in a metallic bilayer waveguide using spin transfer torque.

Findings

Spin wave amplitude can be attenuated or amplified by current direction.

Effective electrical control of spin waves in a magnetic waveguide is demonstrated.

Potential applications in phase-locked nano-oscillators and hybrid devices.

Abstract

We investigate the effect of a direct current on propagating spin waves in a CoFeB/Ta bilayer structure. Using the micro-Brillouin light scattering technique, we observe that the spin wave amplitude may be attenuated or amplified depending on the direction of the current and the applied magnetic field. Our work suggests an effective approach for electrically controlling the propagation of spin waves in a magnetic waveguide and may be useful in a number of applications such as phase locked nano-oscillators and hybrid information processing devices.