单离子各向异性影响下的一维铁磁链中的孤子  

Solitons in a one-dimensional ferromagnetic chain under the influence of single-ion anisotropy

作　　者：翁紫梅[1] 陈浩[1] 

机构地区：[1]华南师范大学物理与电信工程学院,广州510006

出　　处：《物理学报》2007年第4期1911-1918,共8页Acta Physica Sinica

摘　　要：利用行波解法,研究了考虑交换各向异性和单离子各向异性的一维铁磁链,得出椭圆函数波解和孤子解,并讨论了单离子各向异性对椭圆函数波和孤子的影响.研究表明:单离子各向异性对一维铁磁链中椭圆函数波和孤子的激发及其稳定性有显著影响.单离子各向异性不利于易轴铁磁链中椭圆函数波和孤子解的激发,但有利于它们的稳定;而在易平面铁磁链中,单离子各向异性使椭圆函数波和孤子激发变得容易,但不利于它们的稳定.此外,还讨论了单离子各向异性对一维各向同性铁磁链中的孤子激发具有的影响.Cnoidal wave solutions and soliton solutions in a one-dimensional ferromagnetic chain with anisotropy exchange interaction and single-ion anisotropy are obtained through travelling wave solution method and the influence of single-ion anisotropy on enoidal waves and solitons is discussed. The results indicate that single-ion anisotropy makes the enoidal waves and solitons easy to excite in an easy-plane ferromagnetic chain but difficult in an easy-axis one, and makes them more stable in the easy-axis ferromagnetic chain but less stable in the easy-plane one. The influence of single-ion anisotropy on soliton excitations in a onedimensional isotropie ferromagnet is also discussed.

关 键 词：各向异性 单离子各向异性 孤子 铁磁链 

分 类 号：O482.5[理学—固体物理]