Efficient excitation of exchange dominated spin waves in oblique deposited CoFeB thin films

Abstract

Spin waves play a vital role as potential data carriers in low power wave-like computing and high-frequency spintronic devices, which stimulate intensive studies on the efficient excitation of spin waves in magnetic thin films. Here, we suggest a controllable approach for the efficient excitation of perpendicular standing spin waves (PSSWs) in a series of CoFeB/Si thin films by the oblique angle deposition technique. It is experimentally demonstrated that the intensity of the PSSW mode can be enhanced significantly with increased oblique angle, and a comparable intensity of spin wave to that of uniform FMR mode is achieved at an oblique angle of 39°. Moreover, the dependence of in-plane anisotropy field Hk, exchange constant A, as well as intrinsic Gilbert damping α on oblique deposition angle are also investigated.