Condensed matter physics Nanoscale science and low-D systems
Yuri P Kalmykov, Serguey V Titov and William T Coffey, Classical quantum crossover in magnetic stochastic resonance in uniaxial superparamagnets, Journal of Physics: Condensed Matter, 22, 376001, 2010, 7
Journal of Physics: Condensed Matter 22 376001
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) = Hcos t and a dc bias magnetic field H0 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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