Wu Mingzhong, Kalinikos Boris A, Patton Carl E
Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA.
Phys Rev Lett. 2004 Oct 8;93(15):157207. doi: 10.1103/PhysRevLett.93.157207. Epub 2004 Oct 7.
The generation of dark spin wave envelope soliton trains from a continuous wave input signal due to spontaneous modulational instability has been observed for the first time. The dark soliton trains were formed from high dispersion dipole-exchange spin waves propagated in a thin yttrium iron garnet film with pinned surface spins at frequencies situated near the dipole gaps in the dipole-exchange spin wave spectrum. Dark and bright soliton trains were generated for one and the same film through placement of the input carrier frequency in regions of negative and positive dispersion, respectively. Two unreported effects in soliton dynamics, hysteresis and period doubling, were also observed.
首次观测到由于自发调制不稳定性，从连续波输入信号产生暗自旋波包络孤子列。暗孤子列由在具有 pinned 表面自旋的钇铁石榴石薄膜中传播的高色散偶极交换自旋波形成，其频率位于偶极交换自旋波谱中的偶极间隙附近。通过分别将输入载波频率置于负色散和正色散区域，在同一薄膜中产生了暗孤子列和亮孤子列。还观测到了孤子动力学中两个未报道的效应，即滞后和倍周期。
