Correlation, excitation, and relaxation of the antiferromagnetic nanoparticle

Details Correlation, excitation, and relaxation of the antiferromagnetic nanoparticle Correlation, excitation, and relaxation of the antiferromagnetic nanoparticle

2004-01-14

arxiv.org/abs/cond-mat/0401247v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages (4 figures)

Scientific paper

We study the dynamics of spins in the canted antiferromagnetic hematite nanoparticles $\alpha$-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.

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