不純物を添加した PtMnSb 薄膜の磁気光学特性

概要

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Magnetic and magneto-optical properties of the Pt_<0.1-x>Y_x (MnSb) film, where an element Y of Tb, Si or Ge was substituted for Pt, have been investigated to aim at developing a PtMnSb film with a perpendicular magnetization and a large Kerr rotation. Pt_<0.1-x>Y_x (MnSb) films were prepared by an rfsputtering using a MnSb sintered target, on which Pt and Y sheets placed. The crystalline structure of a Pt_<(0.1-x)>Y_xMnSb films prepared was found to be considerably lowered from the Cl_b phase of a stoichiometric PtMnSb with increasing x. For Y=Tb, Ge, the anisotropy constant Ku of the films was found to increase with increasing the value of the content of Y up to -4.5×(10)^5erg/cc, which was about 3 times as large as that of a PtMnSb film, and for Y=Si, the value of K_U decreased. The coercive force H_C for Y=Tb was greater than that of a PtMnSb film, and the polar Kerr rotation angle was found to decrease monotonously with increasing x.
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