双层对称薄膜中自旋波存在条件与各向异性  

The Effect of Uniaxial Anisotropy and Existence Conditionsof the Spin Waves in a Symmetrical Ferromagnetic Bilayer Film

作　　者：王利霞[1] 周文平[1] 侯小娟[1] 

机构地区：[1]内蒙古大学理工学院物理系,内蒙古呼和浩特010021

出　　处：《内蒙古大学学报（自然科学版）》2003年第3期274-279,共6页Journal of Inner Mongolia University：Natural Science Edition

基　　金：内蒙古自然科学基金资助项目

摘　　要：采用界面重标度(IR)方法,研究了非周期性边界条件下,双层铁磁薄膜中自旋波的本征值问题及对称薄膜中自旋波的存在条件;并计入体单轴各向异性,讨论了其对对称铁磁薄膜中自旋波色散关系及波形的影响,结果表明:在完全对称情况下,该系统除了可能存在一支光学—光学界面模外,只存在体模一种形式.而且,体单轴各向异性除了对本征模能量有影响外,对自旋波的色散曲线趋势及波形都没有影响.Based on the theory of quantum exchange interaction, the eigenvalue problem and the existence conditions of the spin waves in a symmetrical ferromagnetic bilayer film are investigated under the nonperiodic boundary condition by the interfacerescaling approach.The effect of the uniaxial anisotropy on the dispersion relation and the wave forms of the spin waves are discussed.It is shown that,under the completely symmetrical condition except for an optical interface mode or an \{acoustic\} mode probable existing only bulk modes exist in the system.in the meantime,the uniaxial anisotropy has no effect on the dispersion curvilinear trend and wave form but on the intrinsic \{energy\}.

关 键 词：自旋波 IR方法 非周期性边界条件 体单轴各向异性 

分 类 号：O484.43[理学—固体物理]