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

摘要

We investigate the effect of a direct current on propagating spin waves in aCoFeB/Ta bilayer structure. Using the micro-Brillouin light scatteringtechnique, we observe that the spin wave amplitude may be attenuated oramplified depending on the direction of the current and the applied magneticfield. Our work suggests an effective approach for electrically controlling thepropagation of spin waves in a magnetic waveguide and may be useful in a numberof applications such as phase locked nano-oscillators and hybrid informationprocessing devices.