Title :
Size and interaction effects in the magnetization reversal in SmCo 5 nanoparticles
Author :
Majetich, S.A. ; Chowdary, K.M. ; Kirkpatrick, E.M.
Author_Institution :
Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
The switching field distribution found from DC demagnetization experiments on ball milled SmCo5 nanoparticles is analysed in terms of several mechanisms for magnetization reversal. By combining the log-normal size distribution with the size-dependent coercivity predicted for different models, switching field distributions are calculated and compared to the experimental results. None of the size-dependent models alone agrees with the Gaussian shape or the linewidth of the experimental data. However, statistically distributed interactions between particles could explain the deviations
Keywords :
cobalt alloys; coercive force; demagnetisation; magnetic particles; magnetic switching; magnetisation reversal; nanostructured materials; samarium alloys; size effect; DC demagnetization; Gaussian shape; SmCo5; SmCo5 nanoparticles; ball milled SmCo5 nanoparticles; interaction effects; linewidth; log-normal size distribution; magnetization reversal; particles; size effects; size-dependent coercivity; statistically distributed interactions; switching field distribution; switching field distributions; Ball milling; Coercive force; Demagnetization; Magnetic anisotropy; Magnetic field measurement; Magnetic switching; Magnetization reversal; Nanoparticles; Perpendicular magnetic anisotropy; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on