Magnetic anisotropy of MBE grown MnPt 3 and CrPt 3 ordered alloy films

CrPt₃ and MnPt₃ alloy films were grown onto MgO(1 1 1), Al₂O₃(0 0 1 c), and fused quartz substrates by MBE method. The (1 1 1) oriented CrPt₃ films on fused quartz, Al₂O₃, and MgO exhibited uniaxial anisotropy K_u of 1.9×10⁶, 0.9×10⁶, and -1.0×10⁶ erg/cm³, respectively. The MnPt₃ on fused quartz and MgO exhibited K_u of -0.8×10⁶ and -0.2×10⁶ erg/cc, respectively. The K_u of CrPt₃ and MnPt₃ on fused quartz was found to be the contribution of the magneto-elastic anisotropy.