Abstract
Pt-Mn-Sb based films are studied to determine their magneto-optical properties in relation to a C1b crystallographic phase. A single C1b phase is obtained in Pt-Mn-Sb ternary films in the 26-33 at% Pt, 30-44 at% Mn and 28-40 at% Sb compositional ranges, and in most of the element-substituted films with (Pt0.7A0.3) MnSb (A=Fe, Co, Ni, Pd, Cu and Au) compositions. The polar Kerr rotation angles (θK) at a 633 nm wavelength under a 6 kOe applied magnetic field, and saturation magnetizations (Ms) for ternary films with the single C1b phase are 1.2-2.0° and 410-530 emu/cc, respectively. A linear relationship between θK and Ms is obtained. θK's and Ms's of the (Pt0.7A0.3) MnSb films are 0.5-1.1° and 270-530 emu/cc, respectively. A linear relationship between θK and optical transmittance is also found for the (Pt0.7A0.3) MnSb films. The Co, Ni and Cu-substituted (Pt0.7A0.3) MnSb films' θK spectra peaks shift to longer wavelengths than those of the ternary films. Consequently, it is found that the magneto-optic and magnetic properties of PtMnSb films are controlled by film composition modulations.
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