Induced uniaxial magnetic anisotropy in disordered FeAl alloys

In Fe‐Al alloys the dependence of the induced uniaxial magnetic anisotropy on concentration, direction, temperature, and time was investigated. The results were compared with a theory given by Néel. The part G of the induced anisotropy is caused by A1–Al atom pairs in nearest neighbour position and F is caused by complexes which consist of more than two substitutional atoms. No any contribution of pairs of next nearest neighbours to F were found. In contrast to a theory by Taniguchi the interaction energy of atom pairs with the direction of magnetization shows a linear dependence on temperature. The formation of the induced anisotropy doesn't follow an exponential function on time and therefore it isn't possible to determine their magnitude and activation energy by usual methods.