We investigate the high-frequency characteristics of epitaxial single crystal α-Fe(001) thin films by permeability spectroscopy with microwave transmission along different in-plane crystal directions. The results show an in-plane isotropic static permeability above 50 with a multidirectional zero-field resonance frequency ( f r ) higher than 8 GHz in the films. We demonstrate that these multidirectional available high-frequency characteristics result from the strong magnetocrystalline anisotropy in the films and not from other kinds of magnetic anisotropies. The study on thickness-dependent films show f r being stable at 8.4 GHz in the films thicker than about 20 nm.
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