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发布时间:2017-04-11 08:53点击:

报告时间:4月13日下午14:00

报告地点:理学楼417

报告人:李再东

报告题目:Solitons, Breathers, and rogue waves in ferromagnet

报告人简介:

李再东,男,2005年山西大学理论物理研究所博士毕业,现为河北工业大学理学院教授,理论物理学术带头人。主持完成国家自然科学基金、河北省杰出青年基金和教育部科学技术研究重点项目等多个项目,主要从事自旋电子学、光脉冲传播理论以及玻色-爱因斯坦凝聚等研究。

报告内容简介:

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 of a magnetic soliton forming the petal with four pieces. The spatial separation of adjacent magnetic petals increases rapidly, while one valley splits into two and 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 anisotropic ferromagnetic nanowires driven by theadiabatic spin-transfer torque. The Dzyaloshinskii-Moriya interaction changes the formation region of soliton solution and the corresponding phase diagram isgiven for different soliton solution type.

 

理学院

2017年4月11日

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