2003/04/01 by T. G. Sorop, M. Evangelisti, Marco Evangelisti +4
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Theoretical and Computational Physics #Transition Metal Oxide Nanomaterials #cond-mat.mtrl-sci
paper · pdf · doi:10.1016/j.jmmm.2003.12.507
published as J. Magn. Magn. Mater. 272-276, 1573 (2004) · 3 pages, 1 figure, Espcrc2, ICM03
arxiv created 2003/04/01 · openalex publication_date 2004/01/02 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.