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Localized states and non-variational Ising-Bloch transition of a parametrically driven easy-plane ferromagnetic wire

Abstract:

A time-periodic magnetic field applied transversally to the hard axis of an extended easy-plane ferromagnetic sample can produce parametric resonance. For the 2:1 resonance, the prototype order-parameter-equation derived from the Landau-Lifshitz-Gilbert dynamical model for the precessional motion is the parametrically driven damped nonlinear Schrödinger equation. Unfortunately this standard approximation fails to meet the stability feature of the synchronized precession states, and we propose some amendment. Localized solutions supported by the uniform states are characterized and classified into two types: motionless and propagative states, rising through a non-variational Ising-Bloch transition. We propose and investigate a dynamical model ruling this transition. © 2009 Elsevier B.V. All rights reserved.