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

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

3032

Lastpage

3034

Abstract

The temperature (T) and field (H) dependence of the transverse susceptibility (χ_T) 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908668

Filename

908668