| Summary: | The dissipative effect of (what could be modeled as) a pinning center on the lowamplitude
motion of a quasi-one-dimensional ferromagnetic soliton (domain wall) at temperature
T = 0 is investigated. The method of collective coordinates is used to eliminate
the problem of the zero-frequency eigenmode and the question is, subsequently, cast into
a Caldeira-Leggett form to calculate the parametrized spectral density function. It is
shown that this function equals zero below a specific frequency with the consequence
that magnons, in the presence of a domain wall, have no dissipative effect at T = 0 on
a slow moving wall trapped by a soft pinning center. === Science, Faculty of === Physics and Astronomy, Department of === Graduate
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