纯交换铁磁介质的非线性表面自旋波  

Nonlinear Surface Spin Waves of Pure-exchange Ferromagnetic Media

作　　者：熊祖周[1] 徐岩[2] 徐世林[2] 陈兵[2] 

机构地区：[1]兰州大学理论物理研究所,甘肃兰州730000 [2]山东科技大学理学院,山东青岛266510

出　　处：《山东科技大学学报（自然科学版）》2010年第2期104-108,共5页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(10847150);教育部留学回国基金项目(教外司留[2008]890号);山东省教育厅项目(J08LI60);山东科技大学"春蕾计划"项目(2008AZZ093)

摘　　要：利用唯象理论,研究了具有非均匀交换各向异性的半无限大纯交换铁磁介质的非线性表面自旋波,导出了被非均匀交换各向异性常数所调制的非线性表面自旋波的色散关系,获得了自旋波包络振幅所满足的二维非线性Schr dinger方程,并对其所存在的单个孤子解的情况作了详细讨论。The theory on nonlinear surface spin waves of pure-exchange ferromagnetic media with inhomogeneous exchange anisotropy was studied by using the phenomenological model.The nonlinear dispersion relation modulated by the parameters of the inhomogeneous exchange anisotropy was obtained for these spin waves.The 2-D nonlinear Schrdinger equation satisfied by the spin wave envelope amplitude of the magnetization was derived.In the case of weakly nonlinear spin waves,the single soliton solution on the basis of 2-D nonlinear Schrdinger equation was discussed in detail.

关 键 词：表面自旋波 LANDAU-LIFSHITZ方程 各向异性 非线性Schrdinger方程 

分 类 号：O482.5[理学—固体物理] O415[理学—物理]