Superparamagnetic behaviour of antiferromagnetic DyPO4 nanoparticles
T.G. Sorop, M. Evangelisti, M. Haase, and L.J. de Jongh
TL;DR
This study investigates the superparamagnetic behavior of DyPO4 nanoparticles at low temperatures, revealing relaxation dynamics influenced by surface spins and magnetic interactions, contributing to understanding nanoparticle magnetism.
Contribution
It provides new insights into the superparamagnetic relaxation of antiferromagnetic DyPO4 nanoparticles considering surface effects and interparticle interactions.
Findings
Superparamagnetic relaxation observed in DyPO4 nanoparticles.
Activation energy for relaxation determined as approximately 2.6 K.
Surface spins significantly influence magnetic behavior.
Abstract
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.
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