Representative hysteresis loops of gradient-composition sputtered FeCoHf films with varied thicknesses measured along easy and hard axes at room temperature.
Permeability spectra of some representative samples with different thicknesses measured at room temperature.
Thickness dependences of (a)—magnetic anisotropy field, (b)—ferromagnetic resonance frequency, and (c)—frequency linewidth measured at room temperature. For each sample with stripe domains, there are two resonance frequencies and frequency linewidths corresponding to the primary peak and the secondary peak.
Imaginary permeability spectra of some representative FeCoHf films with different thicknesses measured at varied temperatures.
Temperature dependence of ferromagnetic resonance frequency fFMR and frequency linewidth Δf for FeCoHf films with different thicknesses. Panel (a) corresponds to the case of the films with singular peak. Panel (b) is for the case of the films with multiple peaks. For the sake of clarity, only the frequency corresponding to primary resonance peak is plotted in panel (b). Panel (c) shows the temperature dependence of the frequency linewidth for the films without stripe domains.
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