arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.01559cond-mat.mtrl-scinlin.PS
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一维磁振子晶体Landau-Lifshitz方程的解析孤子解

Analytical soliton solution for the Landau-Lifshitz equation of one dimensional magnonic crystal

D. Giridharan, M. Daniel, P. Sabareesan

摘要:

研究了周期磁场作用下一维磁子晶体中的非线性局域磁激发。利用赤平投影将Landau-Lifshitz方程转化为变系数非线性薛定谔方程(VCNLS)。VCNLS方程在一般情况下是不可积的,通过Painleve分析,得到了VCNLS方程通过Weiss-Tabor-Painleve(WTC)检验的必要条件.通过进一步探索一种变换,得到了VCNLS方程可积的充分条件,该变换可将VCNLS方程映射到著名的标准非线性薛定谔方程。这种变换将标准非线性薛定谔方程的解与VC-NLS方程的解建立了系统的联系。结果表明,在自旋布洛赫波背景下,存在着具有空间周期的孤立子形式的磁化激发。这种解只要求对VCNLS方程的系数满足一定的约束条件。分析结果表明,一种方法来控制的非线性系数的控制VCNLS方程,这是由铁磁材料,形成磁振子晶体中的一个适当的空间调制的形式的孤子的磁化的动态。

英文摘要:

Nonlinear localized magnetic excitations in one dimensional magnonic crystal is investigated under periodic magntic field. The governing Landau-Lifshitz equation is transformed into variable coefficient nonlinear Schrodinger equation(VCNLS) using sterographic projection. The VCNLS equation is in general nonintegrable, by using painleve analysis necessary conditions for the VCNLS equation to pass Weiss-Tabor-Carnevale (WTC) Painleve test are obtained. A sufficient integrability condition is obtained by further exploring a transformation, which can map the VCNLS equation into the well-known standard nonlinear Schrodinger equation. The transformation built a systematic connection between the solution of the standard nonlinear Schrodinger equation and VC-NLS equation. The results shows the excitation of magnetization in the form of soliton has spatialperiod exists on the background of spin Bloch waves. Such solution exisits only certain constrain conditions on the coefficient of the VCNLS equation are satisfied. The analytical results suggest a way to control the dynamics of magnetization in the form of solitons by an appropriate spatial modulation of the nonlinearity coefficient in the governing VCNLS equation which is determined by the ferromagnetic materials which forms the magnonic crystal.

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