Title :
Zero-field viscosity in perpendicular media
Author :
Wang, S. ; Zhao, T. ; Harrell, J.W.
Author_Institution :
Center for Mater. for Inf. Technol., Alabama Univ., Tuscaloosa, AL, USA
fDate :
9/1/2002 12:00:00 AM
Abstract :
The thermal relaxation of the magnetization has been measured in zero applied field as a function of the remanent magnetization in a CoPtCrB thin film with perpendicular magnetization. The remanent magnetization was obtained by partial dc demagnetization by applying a saturation-reverse-zero-field sequence. The initial viscosity was found to be strongly dependent on the initial remanence and the demagnetization field. The initial viscosity was calculated using a mean-field Arrhenius-Neel model giving good agreement with the experimental data.
Keywords :
boron alloys; chromium alloys; cobalt alloys; demagnetisation; ferromagnetic materials; magnetic aftereffect; magnetic relaxation; magnetic thin films; perpendicular magnetic recording; platinum alloys; remanence; thermal stability; CoPtCrB; CoPtCrB thin film; demagnetization field; initial remanence; initial viscosity; magnetization; mean-field Arrhenius-Neel model; partial dc demagnetization; perpendicular media; remanent magnetization; saturation-reverse-zero-field sequence; thermal relaxation; ultrahigh density recording media; zero applied field; zero-field viscosity; Coercive force; Demagnetization; Magnetic field measurement; Magnetization; Remanence; Thermal factors; Thermal stability; Time measurement; Transistors; Viscosity;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.801808
