量子自旋波本征值及易轴型各向异性对其的影响  

The eigenvalues of quantized spin waves and the effect of the uniaxial anisotropy

作　　者：侯小娟[1,2] 云国宏[1,3] 白宇浩[1] 白那日苏[3] 周文平[1] 

机构地区：[1]内蒙古大学物理科学技术学院,呼和浩特010021 [2]内蒙古科技大学数理与生物工程学院,包头014010 [3]内蒙古师范大学物理与电子信息学院内蒙古自治区功能材料物理与化学重点实验室,呼和浩特010022

出　　处：《物理学报》2011年第5期600-606,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10762001;11072104和50901039);教育部新世纪优秀人才计划(批准号:NCET-05-0272);高等教育博士基金(批准号:200801260003);内蒙古自然科学基金(批准号:200711020115)资助的课题~~

摘　　要：本文考虑体单轴各向异性利用界面重参数化方法从理论上严格推导了两层异质铁磁质中量子自旋波的本征值,并模拟计算了简立方晶格结构(100)第一布里渊区的能带结构,特别研究了易轴型体单轴各向异性对本征值的影响.结果发现在这样的体系中存在体模、禁闭模和界面模;各种本征模与体交换作用、界面交换作用、晶格自旋、原子层数有关,而且各向异性直接影响各种本征模的存在条件.The eigenproblems of quantized spin waves in a（100） ferromagnetic bilayer system have been investigated theoretically by using the interface rescaling approach.The energy-band structure of the system has been obtained and the effect of the uniaxial bulk anisotropy field of easy-axis type on the energy bands were explored thoroughly.It is found that there are bulk modes,perfect confined modes and interface modes in the biferromagnetic system,the existing condition of which is determined not only by the bulk exchange coupling constant,the interface exchange coupling constant,the spin of lattice,the number of atomic layers,but also by the uniaxial bulk anisotropy.

关 键 词：铁磁薄膜 自旋波 各向异性 

分 类 号：O481[理学—固体物理]