Film thickness induced magnetic anisotropy and ferromagnetic resonance in Fe56Co24B20 amorphous films prepared by pulse laser deposition

In this study, we propose a novel method to get higher uniaxial magnetic anisotropy (UMA), i .e . film thickness gradient induced UMA . The detailed sample preparation procedure can be described as follows: (100)-Si single crystal substrates with dimension of 25L×5W×0.5T mm³ are pasted on sample holder. A shutter is put between the target and shutter, and can be scanning back and forth along the length direction of the sample. Therefore, the film thickness with gradient distribution can be controlled by adjusting the scanning angular velocity of the shutter. A magnetic target with composition of Fe₅₆Co₂₄B₂₀ was employed to verify the film thickness gradient induced UMA. The shutter angular velocity is 0 .01^o/min. The elongated sample is divided into 5 equal-sized segments, and numbered the segments as n=1 to 5 respectively according to the film thickness from thicker to thinner.