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

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• 作者：Marcel G. Clerc ; Saliya Coulibaly ; David Laroze
• 关键词：Landau– ; Lifshitz– ; Gilbert equation ; Nonlinear forced oscillator ; Localized states ; Parametrically driven damped nonlinear Schrö ; dinger equation
• 刊名：Physica D
• 出版年：2010
• 出版时间：January 2010
• 年：2010
• 卷：239
• 期：1-2
• 页码：72-86
• 全文大小：2426 K

文摘

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.