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Temperature dependence of magnetocrystalline anisotropy energy determined using Co-Cr-Ta single crystal thin films

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3 Author(s)
Inaba, N. ; Central Res. Lab., Hitachi Ltd., Tokyo, Japan ; Futamoto, M. ; Nakamura, A.

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

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Magnetics, IEEE Transactions on  (Volume:34 ,  Issue: 4 )