Spin-size effects in stochastic resonance in uniaxial superparamagnets
File Type:
PDFItem Type:
Journal ArticleDate:
2010Author:
Access:
OpenAccessCitation:
Yuri P. Kalmykov, Serguey V. Titov, and William T. Coffey, Spin-size effects in stochastic resonance in uniaxial superparamagnets, Physical Review B, 81, 17, 2010, 172411Download Item:
Spin-size.pdf (Published (publisher's copy) - Peer Reviewed) 163.4Kb
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 S 103?105.
Sponsor
Grant Number
European Union (EU)
Author's Homepage:
http://people.tcd.ie/wcoffeyDescription:
PUBLISHED
Author: COFFEY, WILLIAM THOMAS
Publisher:
American Physical SocietyType of material:
Journal ArticleSeries/Report no:
Physical Review B;81;
17;
Availability:
Full text availableKeywords:
Physics, superparamagnetsLicences: