The origin of the non-monotonic field dependence of the blocking temperature in magnetic nanoparticles

Simple item page
dc.creatorZheng, R. K.
dc.creatorGu, Hongwei
dc.creatorXu, Bing
dc.creatorZhang, X. X.
dc.date2005-01-14
dc.date.accessioned2026-07-07T06:31:42Z
dc.date.available2026-07-07T06:31:42Z
dc.descriptionThe field dependence of the peak temperature of the zero-field-cooled (ZFC) magnetization curve of a magnetic nanoparticle system was studied using a diluted magnetic fluid composed of FePt nanoparticles. It is found that the peak temperature increases with increasing applied field below 3 kOe; it then decreases with further increasing the applied field. The non-monotonic field dependence of the peak temperature in magnetic particle systems is attributed to the anisotropic energy barrier distribution of the particles, and to the slowly decreasing magnetization (or to the non-Curies law dependence of magnetization) above the blocking temperature. The non-Curies law dependence of the magnetization is caused by large magnetic anisotropy and Zeeman energy of particles in high magnetic fields. Numerical simulation results, based on basic thermodynamics, and pure thermal relaxation and energy barrier distribution extracted from the low-field, experimental ZFC data show a good agreement with experimental results.
dc.descriptionsubmitted
dc.identifierhttps://arxiv.org/abs/cond-mat/0501329
dc.identifierhttp://arxiv.org/abs/cond-mat/0501329
dc.identifierJ. Phys.: Condens. Matter 18, 5905-5910 (2006)
dc.identifierdoi:10.1088/0953-8984/18/26/010
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98685
dc.subjectOther Condensed Matter
dc.titleThe origin of the non-monotonic field dependence of the blocking temperature in magnetic nanoparticles
dc.typetext

Files

Collections

arXiv