Correlation, excitation, and relaxation of the antiferromagnetic nanoparticle

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We study the dynamics of spins in the canted antiferromagnetic hematite nanoparticles $α$-Fe$_2$O$_3$. The system includes an antiferromagnetic exchange ($J$) between two sublattices as well as the potential dominated by a uniaxial anisotropy and dissipates through the thermally triggered spin-phonon mechanism. The exchange $J$ is found to reduce the superparamagnetic relaxation and drive the incoherent relaxation of transverse spins in the low temperature. Dynamical properties are semi-quantitatively understood within a role of the exchange interaction $J$ and agree well with recent inelastic neutron scattering experiments.
4 pages (4 figures)

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Strongly Correlated Electrons, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/23113

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0401247
 http://arxiv.org/abs/cond-mat/0401247

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arXiv