Correlation, excitation, and relaxation of the antiferromagnetic nanoparticle

2004/01/14 by J. D. Lee, Lee, J. D.
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/0401247

4 pages (4 figures)

arxiv created 2004/01/14 · arxiv updated 2009/12/01

Abstract

We study the dynamics of spins in the canted antiferromagnetic hematite nanoparticles α-Fe₂O₃. 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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