Classical–quantum crossover in magnetic stochastic resonance in uniaxial superparamagnets

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....

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2010-09, Vol.22 (37), p.376001-376001
Main Authors: Kalmykov, Yuri P, Titov, Serguey V, Coffey, William T
Format: Article
Language:English
Subjects:
Computer Simulation
Condensed matter
Displays
Dynamics
Electronics
Fluctuation
Magnetic fields
Magnetic Resonance Spectroscopy
Magnetics
Magnetization
Noise - prevention & control
Quantum Theory
Signal to noise ratio
Stochastic resonance
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/22/37/376001