Abstract
Epitaxial Fe–C films consisting of an α′-Fe–C single phase with a C content up to 12 at% can be synthesized on MgO single crystal substrates by sputtering. The saturation magnetization for the α′-Fe–C films maintains a constant value of about 210 emu/g (≈2.1 T) up to 8 at% C. The easy axis of magnetization of α′-Fe–C films lies in the (0 0 1) plane. The uniaxial magnetocrystalline anisotropy constant for α′-Fe–C is −0.5×10 6 erg/cm 3 independent of the C content. The coercive force for the α′-Fe–C films with C content more than 4 at% is about 2 Oe. The α′-Fe–C films with 4–8 at% C are promising candidates for use as writing head material.
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