Title :
Temperature dependence of magnetocrystalline anisotropy energy determined using Co-Cr-Ta single crystal thin films
Author :
Inaba, Nobuyuki ; Futamoto, Masaaki ; Nakamura, Atsushi
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
fDate :
7/1/1998 12:00:00 AM
Abstract :
The composition and temperature dependencies of uniaxial magnetocrystalline anisotropy constants Ku1 and Ku2 are investigated by torque magnetometry for (101¯0)-oriented Co96-xCrxTa4 single crystal thin films (x=8-19 at.%). The Ku1 and the Ku u2 values of Co88Cr8Ta4 are determined at 290 K to be 2.2×106 and 5.9×105 erg/cm3, 6.9×105 and 5.3×104 erg/cm3, respectively, with increasing Cr concentration from 8 to 19 at.%. When the temperature is increased from 290 to 450 K, Ku1 of Co88Cr8 Ta4 thin films decreases by 27% to 1.6×106 erg/cm3. The temperature dependencies of Ku1 and Ku2 increase with increasing Cr content in Co-Cr-Ta films. The compositional and the temperature dependencies of K u1 and Ku2 are related to the decrease in Curie temperature of Co-Cr-Ta material with increasing Cr concentration
Keywords :
Curie temperature; chromium alloys; cobalt alloys; ferromagnetic materials; magnetic anisotropy; magnetic epitaxial layers; magnetic thin films; tantalum alloys; 290 to 450 K; Co-Cr-Ta; Co88Cr8Ta4; Co96-xCrxTa4; Curie temperature; composition dependence; epitaxial films; magnetocrystalline anisotropy energy; single crystal thin films; temperature dependence; torque magnetometry; uniaxial magnetocrystalline anisotropy constants; Anisotropic magnetoresistance; Chromium; Magnetic anisotropy; Magnetic films; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Plasma temperature; Temperature dependence; Torque; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
