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

Xie Jiayu¹, Deng Zhihao¹, Chang Xia¹, Tang Bing^{1, 2, †}

The magnon dispersion curves of the present ferromagnetic chain system with different values of γ: (a) D = 0, (b) D = 2. The other parameters are set to J = 1, S = 10, a = 1, A = 10, g = μ B = 1 , and B = 1.