Correlation, excitation, and relaxation of the antiferromagnetic nanoparticle
Lee, J. D.
Original · EN
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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