Giant magnetic anisotropy in tetragonal FeCo alloys.
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.
Burkert
Till
T
Department of Physics, Uppsala Universitet, Box 530, 751 21 Uppsala, Sweden. till.burkert@fysik.uu.se
Nordström
Lars
L
Eriksson
Olle
O
Heinonen
Olle
O