Time：14：00, Apr. 13, 2017
Venue：417, Building of Science
Reporter: Zaidong Li
Report Topic：Solitons, Breathers, and Roguewaves in Ferromagnet
About the reporter:
Mr. Li, who obtained his Ph.D. in 2005 from Institute of Theoretical Physics, Shanxi University, is now a professor of Science in Hebei University of Technology. He hosts andcompletes many projects supported by the National Natural Science Foundationand Hebei Province outstanding youth fund, as well as key science and technology projects supported by the Ministry of Education. He is mainly engaged in the research of spintronics, optical pulse propagation theory and Bose – Einstein condensate.
About the report：
In terms of Darboux transformation, we investigate the dynamic process of spin wave passing through amagnetic soliton. It causes nonlinear excitations, such as Akhmediev breathers solution and Kuznetsov-Masoliton. The former case demonstrates a spatial periodic process ofa magnetic soliton forming the petal with four pieces. The spatial separation of adjacent magnetic petals increases rapidly, while one valley splits into twoand the amplitude of valley increases gradually with the increasing amplitude of spinwave. The other case shows a localized process of the spin-wave background. In the limit case, we get rogue waves and clarify its formation mechanism.
We also theoretically investigate the effect of Dzyaloshinskii-Moriya interaction on magnetic soliton in anisotropicferro magnetic nanowires driven by the adiabatic spin-transfer torque. The Dzyaloshinskii-Moriya interaction changes the formation region of soliton solution and the corresponding phase diagram is given for different soliton solution type.
College of Science
Apr. 11, 2017