Spin-size effects in stochastic resonance in uniaxial superparamagnets

Yuri P. Kalmykov, Serguey V. Titov, and William T. Coffey
Phys. Rev. B 81, 172411 – Published 28 May 2010

Abstract

The relaxation dynamics of a uniaxial paramagnet of arbitrary spin value S, interacting with a thermal bath, are treated using the spin-boson model for a particular spin Hamiltonian consisting of the simplest uniaxial potential in the high temperature, Ohmic damping, and weak spin-bath coupling limits. The signal-to-noise ratio of the magnetic moment fluctuations in the stochastic resonance of such a paramagnet displays a pronounced dependence on S for values of S<20. The dependence arises from the quantum spin dynamics which differs markedly from the magnetization dynamics of classical superparamagnets with S103105.

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  • Received 20 April 2010

DOI:https://doi.org/10.1103/PhysRevB.81.172411

©2010 American Physical Society

Authors & Affiliations

Yuri P. Kalmykov1, Serguey V. Titov2, and William T. Coffey3

  • 1Laboratoire de Mathématiques, Physique et Systèmes, Université de Perpignan Via Domitia, 52 Avenue de Paul Alduy, 66860 Perpignan Cedex, France
  • 2Institute of Radio Engineering and Electronics of RAS, 1 Vvedenskii Square, Fryazino, Moscow Region 141190, Russia
  • 3Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland

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Issue

Vol. 81, Iss. 17 — 1 May 2010

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