磁场对铁磁/反铁磁薄膜中自旋波性质的影响  

THE EFFECT OF MAGNETIC FIELD ON THE SPIN WAVES IN FERROMAGNETIC/ANTIFERROMAGNETIC BILAYER FILMS

作　　者：王焕[1] 么强[1] 包锦[1] 

机构地区：[1]内蒙古农业大学理学院,呼和浩特010018

出　　处：《内蒙古农业大学学报（自然科学版）》2010年第4期271-275,共5页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：内蒙古农业大学科技创新团队计划(NDPYTD2010-7)

摘　　要：在一维海森堡模型的基础上,采用界面参数化方法,研究了非周期边界条件下双层铁磁/反铁磁薄膜中自旋波本征激发问题.通过联立求解能量约束方程和界面参数化方程,获得了全部的自旋波本征解,发现系统中存在体模、完全禁闭模和界面模3类不同自旋波.另外,发现磁场对自旋波的能量、能级结构有较强的影响.在强磁场下,能级结构中出现了能隙,能隙中可能存在1种声学-光学新型界面模.Based on one-dimension Heisenberg model,the eigenproblems of spin waves in ferromagnetic and antiferromagnetic bilayer are solved by use of interface-rescaling approach under the nonperiodic boundary condition.The eigenvalue of spin waves are obtained,which is to solve energy constrained equation and interface rescaling equation.It is shown that three types of spin waves exist in the system： the bulk mode,the interface mode,and the perfect confined mode.Moreover,the energy and energy level structure of spin waves can be controlled by altering the magnetic field.The energy gap is observed in energy level structure under strong magnetic field.A new interface mode,acoustic-optical mode,will be existed in energy gap.

关 键 词：铁磁/反铁磁薄膜 自旋波 界面参数化方法 

分 类 号：O484.43[理学—固体物理]