Title :
RF dynamics in nanoparticle systems with tuned strength of interactions
Author :
Spinu, L. ; Tung, L.D. ; Kolesnichenko, V. ; Fang, J. ; Stancu, A. ; O´Connor, C.J.
Author_Institution :
Adv. Mater. Res. Inst., New Orleans Univ., LA, USA
fDate :
9/1/2002 12:00:00 AM
Abstract :
The dynamic response in a large experimental time window (10-6-102 s) of Co and CoPt nanoparticle systems is reported. In order to reveal the dynamics effects, along with classic experiments as a.c. susceptibility and static magnetic measurements, a RF temperature dependent transverse susceptibility experiment is used. To study the effect of interaction between particles, samples of Co and CoPt nanoparticles dispersed in an insulating matrix in different volume fractions were investigated.
Keywords :
cobalt; cobalt alloys; ferromagnetic materials; magnetic particles; magnetic susceptibility; nanostructured materials; platinum alloys; Co; CoPt; EDAX analysis; RF dynamics; dipolar interactions; dynamic response; higher amplitude peak; interparticle interactions; magnetic nanoparticle systems; temperature dependent susceptibility; transmission electron microscopy; transverse susceptibility; tuned strength of interactions; Insulation; Magnetic anisotropy; Magnetic moments; Magnetic properties; Magnetic susceptibility; Magnetization; Nanoparticles; Perpendicular magnetic anisotropy; Radio frequency; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.803206
