TEMPERATURE DEPENDENCE OF THE MAGNETIC VISCOSITY IN CoCrTa AND CoCrPtTa THIN FILMS

نویسنده

  • Hiroaki NISHIO
چکیده

The temperature dependence of the magnetic viscosity coefficient (Sv), the activation volume (Vact) and the coercivity (Hc) were examined for CoCrTa/Cr and CoCrPtTa/Cr thin films in the temperature range from 200 to 423 K. This experiment shows that the medium noise measured for 150 kFCI is approximately proportional to kT/Sv (=Vact X Ms) at 298K. kT/Sv and the temperature variation of coercivity (dHc/dT) increase with increasing temperature. The relationship, HA/50Sv > 1 was obtained from the thermal stability of magnetization, where HA is the anisotropy field. However, in practice one must compare Hc instead of HA with 50Sv. The factor Hc/50Sv, a measure of the thermal stability of the magnetization, was close to 1.3 -1.7 at 373 K.

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تاریخ انتشار 2011