Nonlinear behavior in magnetic transients

We examine the motion of a spin subject to a static external field, dynamic demagnetizing fields, and a relatively weak oscillatory driving field. More specifically, we study the initial transient behavior just after all these fields are turned on and present analytic calculations based on an approx...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2009-10, Vol.321 (20), p.3472-3477
Main Authors: Smith, Ryan K., Grabowski, Marek, Camley, R.E.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical-point effects, specific heats, short-range order
Exact sciences and technology
Magnetic
Magnetic properties and materials
Magnetization
Nonlinear
Numerical simulation studies
Physics
Transient
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Summary:We examine the motion of a spin subject to a static external field, dynamic demagnetizing fields, and a relatively weak oscillatory driving field. More specifically, we study the initial transient behavior just after all these fields are turned on and present analytic calculations based on an approximation scheme for the motion of the spin. We find that two modes – a mode at the driving frequency and a mode at the natural resonant frequency – play an important role in the initial transient. Because of the nonlinear nature of the spin equations of motion, one also finds, only in the initial transient, modes with doubled frequencies of the initial two modes and modes involving the sum and difference frequencies of the initial two modes. We also examine large amplitude transients in specific cases through numerical calculations.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2009.06.071