Spin Pumping in Magnetostrictive Ta/FeGaB/Ta Multilayer Thin Films

Abstract

The magnetostrictive multilayer thin film stack (Ta/FeGaB(t)/Ta) deposited/sputtered, studied the surface morphology, static and dynamic magnetic properties. The static magnetic properties multilayer studied; the coercive field and squareness increased for increasing thickness of FeGaB. The systematic study of damping in Ta/FeGaB/Ta multilayer performed by use of broadband ferromagnetic resonance (FMR) spectroscopy in-plan geometry in the range of temperature from 300 K to 100 K. The data were fitted to obtain the inhomogeneous line width (∆H0) and the damping factor (α). The damping factor is enhanced for the increased thickness of FeGaB. The enhancement of damping is due to spin pumping at the interface of Ta and FeGaB. The spin mixing conductance (geff) was calculated for magnetostriction thin films FeGaB; which had been increased for lowering the temperature. At 0 K, the geff of thin-film stack has 0.141 × 1018 m−2. Therefore, the magnetostriction multilayer film stack can be used for magnonics, spin caloritronics, and spintronics applications.