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Classical-quantum crossover in magnetic stochastic resonance in uniaxial superparamagnets
Yuri P Kalmykov1, Serguey V Titov, William T Coffey
1Laboratoire de Mathématiques, Physique et Systèmes, Université de Perpignan Via Domitia, Perpignan, France.
Abstract:
It is shown that the signal-to-noise ratio of the magnetic moment fluctuations in the magnetic stochastic resonance of a quantum uniaxial paramagnet of arbitrary spin value S subjected to a weak probing ac field H(t) = H cos Ωt and a dc bias magnetic field H(0) displays a pronounced dependence on S. The dependence arises from the quantum dynamics of spins which differs markedly from the magnetization dynamics of classical superparamagnets. In the large spin limit, S --> ∞, the quantum solutions reduce to those for a classical uniaxial superparamagnet.
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