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Figure 1.  (a) The in-plane magnetic hysteresis loop of FeNi thin film with a thickness of 70 nm at easy and hard axes. (b) The in-plane magnetic hysteresis loop of FeNi thin film with different thicknesses at the hard axis. (c) Two curves of H_c and H_s changing with thicknesses, respectively.

Figure 2.  (a) XRD patterns of FeNi thin film with different thicknesses. The inset shows the change of grain size with thicknesses of FeNi thin film. (b) The change of surface roughness with thicknesses of FeNi thin film. The inset shows the morphology of these samples measured by the AFM.

Figure 3.  (a) Schematic illustration of FMR using a vector network analyzer. (b) Experimental data (dots) and fitting curves (lines) of FMR for 210 nm-thick FeNi thin film. (c) The applied microwave frequency versus the resonance magnetic field with different thicknesses of FeNi thin film. (d) The change of H_k and 4πM_eff with different thicknesses of FeNi thin film.

Figure 4.  (a) The dynamic real part μ′ and (b) imaginary part μ″ of complex permeability spectra of FeNi thin film. The change of (c) permeability μ_i and (d) resonance frequency peak with thicknesses of FeNi thin film.

Figure 5.  Curves produced under an unfolded state and after being folded for ten cycles and twenty cycles. The top inset shows more cracks with increasing folding cycles. The bottom inset shows the folding schematic diagram.