中国物理B ›› 2019, Vol. 28 ›› Issue (7): 77501-077501.doi: 10.1088/1674-1056/28/7/077501

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Discrete modulational instability and bright localized spin wave modes in easy-axis weak ferromagnetic spin chains involving the next-nearest-neighbor coupling

Jiayu Xie(谢家玉), Zhihao Deng(邓志豪), Xia Chang(昌霞), Bing Tang(唐炳)   

  1. 1 College of Physics, Mechanical and Electrical Engineering, Jishou University, Jishou 416000, China;
    2 The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology, Jishou University, Jishou 416000, China
  • 收稿日期:2019-03-12 修回日期:2019-05-04 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Bing Tang E-mail:bingtangphy@jsu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11604121 and 11875126), the Natural Science Fund Project of Hunan Province, China (Grant No. 2017JJ3255), the National College Students' Innovation Entrepreneurship Training Program, China (Grant No. 201810531014), and the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No. 17B212).

Discrete modulational instability and bright localized spin wave modes in easy-axis weak ferromagnetic spin chains involving the next-nearest-neighbor coupling

Jiayu Xie(谢家玉)1, Zhihao Deng(邓志豪)1, Xia Chang(昌霞)1, Bing Tang(唐炳)1,2   

  1. 1 College of Physics, Mechanical and Electrical Engineering, Jishou University, Jishou 416000, China;
    2 The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology, Jishou University, Jishou 416000, China
  • Received:2019-03-12 Revised:2019-05-04 Online:2019-07-05 Published:2019-07-05
  • Contact: Bing Tang E-mail:bingtangphy@jsu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11604121 and 11875126), the Natural Science Fund Project of Hunan Province, China (Grant No. 2017JJ3255), the National College Students' Innovation Entrepreneurship Training Program, China (Grant No. 201810531014), and the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No. 17B212).

摘要:

We report a theoretical work on the properties of modulational instability and bright type nonlinear localized modes in one-dimensional easy-axis weak ferromagnetic spin lattices involving next-nearest-neighbor couplings. With a linear stability analysis, we calculate the growth rates of the modulational instability, and plot the instability regions. When the strength of the next-nearest-neighbor coupling is large enough, two new asymmetric modulational instability regions appear near the boundary of the first Brillouin zone. Furthermore, analytical forms of the bright nonlinear localized modes are constructed by means of a quasi-discreteness approach. The influence of the next-nearest-neighbor coupling on the Brillouin zone center mode and boundary mode are discussed. In particular, we discover a reversal phenomenon of the propagation direction of the Brillouin zone boundary mode.

关键词: modulational instability analysis, intrinsic localized spin-wave modes, weak ferromagnets, next-nearest-neighbor couplings

Abstract:

We report a theoretical work on the properties of modulational instability and bright type nonlinear localized modes in one-dimensional easy-axis weak ferromagnetic spin lattices involving next-nearest-neighbor couplings. With a linear stability analysis, we calculate the growth rates of the modulational instability, and plot the instability regions. When the strength of the next-nearest-neighbor coupling is large enough, two new asymmetric modulational instability regions appear near the boundary of the first Brillouin zone. Furthermore, analytical forms of the bright nonlinear localized modes are constructed by means of a quasi-discreteness approach. The influence of the next-nearest-neighbor coupling on the Brillouin zone center mode and boundary mode are discussed. In particular, we discover a reversal phenomenon of the propagation direction of the Brillouin zone boundary mode.

Key words: modulational instability analysis, intrinsic localized spin-wave modes, weak ferromagnets, next-nearest-neighbor couplings

中图分类号:  (Quantized spin models, including quantum spin frustration)

  • 75.10.Jm
75.30.Ds (Spin waves) 63.20.Pw (Localized modes)