Perpendicular magnetocrystalline anisotropy in tetragonally distorted Fe-Co alloys |
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Authors: | Andersson Gabriella Burkert Till Warnicke Peter Björck Matts Sanyal Biplab Chacon Cyril Zlotea Claudia Nordström Lars Nordblad Per Eriksson Olle |
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Institution: | Department of Physics, Uppsala Universitet, Box 530, 751 21 Uppsala, Sweden. gabriella.andersson@fysik.uu.se |
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Abstract: | 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 microeV/atom, and a saturation magnetization of 2.5 microB/atom at 40 K, in qualitative agreement with theoretical predictions. At room temperature the corresponding values and 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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