title: Dynamic fluctuations of dipolar semiflexible filaments.
abstract: On the basis of the model of a flexible magnetic filament, the characteristics of their thermal fluctuations are considered. The crossover of the time dependence of the mean quadratic displacement from t(3/4) to t(1/2) at the magnetic field increase is found. Two characteristic mechanisms of the magnetization relaxation time distribution--straightening of the thermal undulations and excitation of the bending modes of the free ends under the action of an ac magnetic field--are described. In both cases, the characteristic scaling law omega(-3/4) of the magnetic susceptibility in a high-frequency range is found.
authors.affiliation: University of Latvia, Zellu-8, Riga, Latvia.
authors.forename: M
authors.initials: M
authors.lastname: Belovs
authors.forename: A
authors.initials: A
authors.lastname: Cēbers