We report on the experimental realization of tetragonal Fe-Co alloys as a constituent of Fe0.36Co0.64/Pt superlattices with huge perpendicular magnetocrystalline anisotropy energy, reaching 210 μeV/atom, and a saturation magnetization of 2.5μB/atom at 40 K, in qualitative agreement with theoretical predictions. At room temperature the corresponding values 150 μeV/atom and 2.2μB/atom are achieved. This suggests that Fe-Co alloys with carefully chosen combinations of composition and distortion are good candidates for high-density perpendicular storage materials.
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Andersson et al. (2006) studied this question.
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