Title :
Compositional and temperature dependence of basic magnetic properties of CoCr-alloy thin films
Author :
Inaba, Nobuyuki ; Uesaka, Yasutaro ; Futamoto, Masaaki
Author_Institution :
Tsukuba Res. Lab., Hitachi Maxell Ltd., Ibaraki, Japan
Abstract :
Compositional and temperature dependencies of saturation magnetization (Ms) and uniaxial magnetocrystalline anisotropy (Ku) are determined using single crystal CoCr-alloy thin films. Temperature dependencies of Ms and Ku are stronger with increasing Cr content. Ms(OK) and Curie temperature (Tc) decrease linearly with increasing Cr content in a Co-Cr-X (X=Ta, Pt) system. Ms(OK) and Tc become zero at the Cr concentration of 33 at.%, Co-Cr-Pt specimens have higher Tc and higher Ku than those of Co-Cr-Ta specimens with similar Cr concentration. The magnetic properties of polycrystalline medium are confirmed to depend strongly on those of Co-rich core crystalline grains in Cr segregated microstructure.
Keywords :
Curie temperature; chromium alloys; cobalt alloys; ferromagnetic materials; grain size; hard discs; magnetic anisotropy; magnetic thin films; platinum alloys; tantalum alloys; CoCrPt; CoCrTa; Curie temperature; core crystalline grains; magnetic properties; polycrystalline medium; saturation magnetization; segregated microstructure; temperature dependencies; uniaxial magnetocrystalline anisotropy; Anisotropic magnetoresistance; Chromium; Magnetic anisotropy; Magnetic cores; Magnetic films; Magnetic properties; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature dependence; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
