Title :
Superparamagnetism and transverse susceptibility in magnetic nanoparticle systems
Author :
Spinu, L. ; Srikanth, H. ; Wiemann, J.A ; Li, S. ; Tang, J. ; O´Connor, C.J.
Author_Institution :
Adv. Mater. Res. Inst., New Orleans Univ., LA, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
The temperature (T) and field (H) dependence of the transverse susceptibility (χT) of a magnetic nanoparticle system has been investigated. The temperature dependence is found to exhibit characteristic features that can be related to relaxation behavior in nanoscale magnetic systems. To the best of our knowledge, this is the first time the full temperature and field dependence of the experimentally determined transverse susceptibility is presented for a magnetic nanoparticle system, The experimental data are interpreted using a modified coherent magnetization rotation model based on a two level approach
Keywords :
composite materials; iron compounds; magnetic particles; magnetic relaxation; magnetic susceptibility; magnetisation; nanostructured materials; silver; superparamagnetism; γ-Fe2O3-Ag; Fe2O3-Ag; coherent magnetization rotation; field dependence; magnetic nanoparticle systems; nanocomposite; relaxation behavior; superparamagnetism; temperature dependence; transverse susceptibility; two level approach; Magnetic anisotropy; Magnetic field measurement; Magnetic materials; Magnetic properties; Magnetic susceptibility; Magnetization; Magnetostatics; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
