Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-01-14
J. Phys.: Condens. Matter 18, 5905-5910 (2006)
Physics
Condensed Matter
Other Condensed Matter
submitted
Scientific paper
10.1088/0953-8984/18/26/010
The 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.
Gu Hongwei
Xu Bing
Zhang Xinyu
Zheng R.-K.
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