NiAs-type Mn (SbBi) alloy films, with c-axes oriented perpendicular to the film surface, were obtained in the composition range 45 < Mn < 65 at%, Bi < 10 at% by forming an oriented SbBi layer by vapor deposition and annealing, depositing an Mn layer onto this SbBi layer at an appropriate substrate temperature and annealing at temperatures up to 500°C. Several different phases appeared in these films, the matrix of which was the NiAs-type Mn (SbBi) phase. It was found that the phases and lattice constants of Mn (SbBi) change on increasing the annealing temperature. Systematic experiments on the magnetic anisotropy constant Ku and the Kerr rotation angle θK were carried out. It was found that substitution of Bi for Sb led to an increased Ku value and a change in the wavelength dependence of θK. The maximum observed values of Ku and θK were 4.5 × 106 erg/cm3 and 0.5°, respectively, at Hex = 7 kOe.
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