Perpendicular magnetocrystalline anisotropy in tetragonally distorted Fe-Co alloys.
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.
Andersson
Gabriella
G
Department of Physics, Uppsala Universitet, Box 530, 751 21 Uppsala, Sweden. gabriella.andersson@fysik.uu.se
Burkert
Till
T
Warnicke
Peter
P
Björck
Matts
M
Sanyal
Biplab
B
Chacon
Cyril
C
Zlotea
Claudia
C
Nordström
Lars
L
Nordblad
Per
P
Eriksson
Olle
O