Browsing Electronic & Electrical Eng (Scholarly Publications) by Author "COFFEY, WILLIAM"
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Inertial and bias effects in the rotational brownian motion of rodlike molecules in a uniaxial potential.
COFFEY, WILLIAM (2011)Inertial effects in the rotational Brownian motion in space of a rigid dipolar rotator (needle) in a uniaxial potential biased by an external field giving rise to asymmetry are treated via the infinite hierarchy of ... 
Nonlinear noninertial response of a quantum Brownian particle in a tilted periodic potential to a strong ac force as applied to a point Josephson junction
COFFEY, WILLIAM; KALYMYKOV, YURI (2009)The normal phase diffusion problem in magnetic resonance imaging (MRI) is treated by means of the Langevin equation for the phase variable using only the properties of the characteristic function of Gaussian random variables. ... 
Phase space master equations for quantum Brownian motion in a periodic potential: comparison of various kinetic models
DOWLING, WILLIAM; COFFEY, WILLIAM (2011)The dynamics of quantum Brownian particles in a cosine periodic potential are studied using the phase space formalism associated with the Wigner representation of quantum mechanics. Various kinetic phase space master ... 
Quantum effects in the Brownian motion of a particle in a double well potential in the overdamped limit.
CLEARY, LIAM; COFFEY, WILLIAM (2009)Quantum effects in the noninertial Brownian motion of a particle in a double well potential are treated via a semiclassical Smoluchowski equation for the time evolution of the reduced Wigner distribution function in ... 
Semiclassical master equation in Wigner's phase space applied to the Brownian motion in a periodic potential
COFFEY, WILLIAM (2007)The quantum Brownian motion of a particle in a cosine periodic potential V x =?V0 cos x/x0 is treated using the master equation for the time evolution of the Wigner distribution function W x, p, t in phase space x, p ... 
Semiclassical treatment of a Brownian ratchet using the quantum Smoluchowski equation
COFFEY, WILLIAM; CLEARY, LIAM (2009)Quantum effects in the noninertial Brownian motion of a particle in a onedimensional ratchet potential are treated in the high temperature and weak bathparticle coupling limit by solving a quantum Smoluchowski equation ... 
Spintorque effects in thermally assisted magnetisation reversal: Method of statistical moments
COFFEY, WILLIAM (2013)Thermal fluctuations of nanomagnets driven by spinpolarized currents are treated via the LandauLifshitzGilbert equation generalized to include both the random thermal noise field and the Slonczewski spintransfer torque ... 
Thermal fluctuations of magnetic nanoparticles: fifty years after Brown
COFFEY, WILLIAM (2012)The reversal time, superparamagnetic relaxation time, of the magnetization of fine single domain ferromagnetic nanoparticles owing to thermal fluctuations plays a fundamental role in information storage, paleomagnetism, ...