Investigation Into Magnetic Anisotropy of Low-Temperature Phase MnBi Thin Films

Abstract

The temperature dependence of magnetic anisotropy in the low-temperature phase MnBi thin films is discussed in conjunctionwith saturation magnetization and lattice constants. It is experimentally found that $K_{u}$ is inversely proportional to the eighth power of the saturation magnetization $M_{s}$ . It is also found that the $K_{u}$ is proportional to the unit-cell volume. The calculation based on first principles of magnetic anisotropy energy as a function of lattice constants ( $a$ and $c$ ) and statistical simulations of its spin-temperature dependence is consistent with the experimental results. However, the spin-reorientation transition taking place at 100 K is not accounted for by the present calculation.