Superparamagnetic behaviour of antiferromagnetic DyPO4 nanoparticles

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We report on the low-temperature magnetic ac-susceptibility of antiferromagnetic DyPO4 nanoparticles with a very high surface to volume ratio. The results are interpreted in terms of superparamagnetic relaxation of the Neel vector arising from a relatively large number approx 0.2 Na of uncompensated spins probably existing on the surface of the nanoparticles. The activation energy of the relaxation process is found to be Ea / kB = (2.6+-0.1) K within a model taking into account the magnetic interaction between nanoparticles.
3 pages, 1 figure, Espcrc2, ICM03

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Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/21142

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0304016
 http://arxiv.org/abs/cond-mat/0304016
 J. Magn. Magn. Mater. 272-276, 1573 (2004)
 doi:10.1016/j.jmmm.2003.12.507

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arXiv