Structural, Magnetic, and Magneto-Optic Properties of Ti-Substituted MnBi Films

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Abstract
Structural, magnetic, and magneto‐optic properties of Mn1−xTixBi films (0≤x≤0.2) prepared by a vacuum‐evaporation technique are reported. The crystallographic structure and the order of phase transformations of unsubstituted MnBi films were not altered by Ti. Both low‐temperature (LT) phase and quenched high‐temperature (HT) phase films were oriented with the hexagonal c axis and the magnetization normal to the film plane. The Curie temperature of HT films was decreased by Ti. There is a strong effect of Ti on the kinetics of the crystallographic phase transformations in the films. Particularly, the speed of the HT‐phase‐to‐LT‐phase transformation is reduced by up to three orders of magnitude, depending on the Ti concentration and the temperature. At room temperature the specific Faraday rotation of LT (HT) phase films decreased with increasing Ti concentration from 9.8 × 105 deg/cm (4.3 × 105 deg/cm) for x = 0 to 3.8 × 105 deg/cm (1.6 × 105 deg/cm) for x = 0.18, measured with light of 632.8‐nm wavelength. The optical absorption coefficient, typically 5.3 × 105 cm−1 at 25°C and 632.8 nm, was not changed appreciably by Ti.

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