Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Magnetic Nanoparticles
MA 9.9: Vortrag
Montag, 31. März 2014, 17:15–17:30, HSZ 401
ON THE NONLINEAR RESPONSE OF NON-INTERACTING ELECTRIC DIPOLES AND SINGLE DOMAIN FERROFLUID PARTICLES SUBJECTED TO STRONG ALTERNATING AND DC BIAS FIELDS — Y.P. Kalmykov1, •William T. Coffey2, and N. Wei3 — 1University of Perpignan, Perpignan, France — 2Department of Electronic and Electrical Engineering, Trinity College, Dublin — 3Department of Electronic and Electrical Engineering, Trinity College, Dublin
The perturbation theory approach to the nonlinear dielectric relaxation of noninteracting permanent electric dipoles (W.T.Coffey and B.V.Paranjape, Dielectric and Kerr Effect Relaxation in Alternating Electric Fields, Proc. R.Ir. Acad. Section A, 78, 17 (1978)) and the analogous magnetic relaxation of ferrofluids is revisited for the particular case of a strong D.C. bias field superimposed on a strong A.C. field. Unlike weak A.C. and strong bias D.C. fields, a frequency dependent D.C. term now appears in the response as well as additional nonlinear terms at the fundamental and second harmonic frequencies. These may be experimentally observable particularly in the ferrofluid application, the corresponding result for the D.C. term for anomalous relaxation is also given.