Abstract
MnBiAl films were prepared by vacuum interdiffusion alloying. We report on the magneto-optical properties and low temperature magnetization of this material. By eliminating the Faraday contribution from the glass substrates, a remanant Kerr rotation of 3.22° at 632.8 nm is measured at room temperature. At a wavelength of 376 nm, the remanent Kerr rotation is 2.25°. Superconducting quantum interference device magnetometer examination showed that there is no spin transition at low temperature for the MnBiAl films. By decreasing the temperature from 280 to 5 K, the perpendicular remanant magnetization of the MnBi0.47Al0.15 films remains along the c axis and increases about 12% in magnitude, while MnBi changes its easy axis from the c axis to the base plane at around 84 K. This suggests that both the lattice shrinkage and chemical interactions among Mn, Bi, and Al atoms play important roles in the magnetic properties of MnBi0.47Al0.15 alloy films.
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