Giant magnetic anisotropy in tetragonal FeCo alloys |
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Authors: | Burkert Till Nordström Lars Eriksson Olle Heinonen Olle |
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Affiliation: | Department of Physics, Uppsala Universitet, Box 530, 751 21 Uppsala, Sweden. till.burkert@fysik.uu.se |
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Abstract: | In order to further increase the recording density in hard disk drives, new media materials are required. Two essential parameters of future recording media are a large uniaxial magnetic anisotropy energy (MAE) K(u) and a large saturation magnetization M(s). Based on first-principles theory, we predict that very specific structural distortions of FeCo alloys possess these desired properties. The discovered alloy has a saturation magnetization that is about 50% larger than that of FePt--a compound that has received considerable attention lately-with a uniaxial MAE that can easily be tailored reaching a maximum value that is 50% larger than that of FePt. |
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