Browsing by Author "COFFEY, WILLIAM THOMAS"
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Anisotropic rotational diffusion and transient nonlinear responses of rigid polar macromolecules in a strong external electric field
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Institute of Physics, 2007)Nonlinear transient responses of polar polarizable particles (macromolecules) diluted in a nonpolar solvent to a sudden change in magnitude of a strong external dc field are evaluated using the anisotropic noninertial ... 
Anomalous dielectric relaxation in an Nfold cosine potential
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 2003)The fractional KleinKramers (FokkerPlanck) equation describing the fractal time dynamics of an assembly of fixed axis dipoles rotating in an Nfold cosine potential representing the internal field due to neighboring ... 
Anomalous nonlinear dielectric and Kerr effect relaxation steady state responses in superimposed ac and dc electric fields
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Institute of Physics, 2007)It is shown how the rotational diffusion model of polar molecules (which may be described in microscopic fashion as the diffusion limit of a discrete time random walk on the surface of the unit sphere) may be extended to ... 
Bimodal approximation for anomalous diffusion in a potential
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 2004)Exact and approximate solutions of the fractional diffusion equation for an assembly of fixedaxis dipoles are derived for anomalous noninertial rotational diffusion in a doublewell potential. It is shown that knowledge ... 
Calculation of the rise transient and relaxation time of the induced dipole Kerr effect
COFFEY, WILLIAM THOMAS (American Physical Society, 1996)The exact calculation of the rise transient of the birefringence and the corresponding relaxation times by different theoretical methods is described, in particular the Kerreffect response of an assembly of nonpolar but ... 
Classical quantum crossover in magnetic stochastic resonance in uniaxial superparamagnets
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (2010)It is shown that the signaltonoise 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) = ... 
Comparison of methods for the calculation of superparamagnetic relaxation times
COFFEY, WILLIAM THOMAS (American Physical Society, 1996)A general expression for the correlation time of the decay of the magnetization of an assembly of singledomain noninteracting ferromagnetic particles is given in terms of the inverse of the FokkerPlanck operator. The ... 
Constantmagneticfield effect in Neel relaxation of singledomain ferromagnetic particles
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (1995)The relaxation behavior of an assembly of noninteracting singledomain ferromagnetic particles in the presence of a constant magnetic field is studied by solving the corresponding FokkerPlanck equation. The analysis is ... 
Contribution of particle inertial effects to resonance in ferrofluids
COFFEY, WILLIAM THOMAS (American Physical Society, 1995)The effect of the moment of inertia of single domain ferromagnetic particles on the frequencydependent complex susceptibility ?(?)=??(?)i???(?) of ferrofluids is reported. It is demonstrated that particle inertial effects ... 
Damping dependence of the reversal time of the magnetization of singledomain ferromagnetic particles for the NeelBrown model: Langevin dynamics simulations versus analytic results
COFFEY, WILLIAM THOMAS (American Physical Society, 2010)The damping dependence of the thermally activated reversal time of the magnetization of noninteracting uniaxial singledomain ferromagnetic particles is determined using Langevin dynamics simulations and the analytic ... 
Dynamic susceptibilities of an assembly of dipolar particles in an elastic environment
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 2001)Theoretical model to describe magnetodynamics of a ferrogel, i.e., an assembly of ferromagnetic nanoparticles embedded in a gel, is proposed. The reorientations of the particles are determined by the influence of the elastic ... 
Effect of a uniform bias force on the Brownian movement in doublewell potentials
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 1997)A general property of the Brownian motion in a bistable potential with the asymmetry arising from the imposition of a bias force is described. The property is that, at values of the bias force far less than the critical value ... 
Effect of an oblique magnetic field on the superparamagnetic relaxation time
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 1995)The effect of a constant magnetic field, applied at an angle to the easy axis of magnetization, on the Neel relaxation time of a single domain ferromagnetic particle (with uniaxial anisotropy) is studied by calculating the ... 
Effect of an oblique magnetic field on the superparamagnetic relaxation time. II. Influence of the gyromagnetic term
COFFEY, WILLIAM THOMAS (1998)The effect of a uniform magnetic field applied at an oblique angle to the easy axis of magnetization on the superparamagnetic (longitudinal or Neel) relaxation time is investigated by numerically solving the FokkerPlanck ... 
Effectiveeigenvalue approach to the nonlinear Langevin equation for the Brownian motion in a tilted periodic potential. II. Application to the ringlaser gyroscope
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 1993)The effectiveeigenvalue method is used to obtain an approximate solution for the mean beatsignal spectrum for the ringlaser gyroscope in the presence of quantum noise. The accuracy of the effectiveeigenvalue method is ... 
Effectiveeigenvalue approach to the nonlinear Langevin equation for the Brownian motion in a tilted periodic potential: Application to the Josephson tunneling junction
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 1993)The effectiveeigenvalue method is used for a calculation of the impedance of the Josephson tunneling junction for an externally applied smallsignal alternating current in the presence of noise. The accuracy of the method ... 
Exact analytic formula for the correlation time of a singledomain ferromagnetic particle
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 1994)Exact solutions for the longitudinal relaxation time T and the complex susceptibility ?(?) of a thermally agitated singledomain ferromagnetic particle are presented for the simple uniaxial potential of the crystalline ... 
Fractional rotational diffusion of rigid dipoles in an asymmetrical doublewell potential
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH; VIJ, JAGDISH KUMAR (American Physical Society, 2005)The longitudinal and transverse components of the complex dielectric susceptibility tensor of an assembly of dipolar molecules rotating in an asymmetric doublewell potential are evaluated using a fractional rotational ... 
Fractional translational diffusion of a Brownian particle in a double well potential
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Institute of Physics, 2006)The fractional translational diffusion of a particle in a doublewell potential (excluding inertial effects) is considered. The position correlation function and its spectrum are evaluated using a fractional probability ... 
Inertial effects in anomalous dielectric relaxation
COFFEY, WILLIAM THOMAS; KALYMYKOV, YURI PETROVICH (American Physical Society, 2002)The inertia corrected Debye model of rotational Brownian motion of polar molecules is generalized to fractional dynamics (anomalous diffusion) in the context of the fractional KleinKramers equation. The fractal generalization ...