Nonlinear spin wave dynamics in thin magnetic films and structures

该项目是明斯特大学，TU Kaiserlestern和俄罗斯彼得堡电工大学长期双边和三方合作的结果。 合作的主要目的是研究各种基本的非线性自旋波现象。本文主要研究了形状可控的自旋波单孤子和多孤子波包的产生、基于铁磁薄膜和多铁性层状结构的有源环中自旋波混沌振荡的同步以及自旋电流驱动的低阻尼金属磁性微纳米系统中的非线性自旋波模，主动和被动磁系统的同时研究使我们能够全面调查各种各样的影响，属于最现代的磁性方向。实验将使用几种互补技术进行，即传统和行波微波光谱，以及时间，空间和相位分辨布里渊光散射光谱，包括独特的近场BLS光谱仪，允许二维空间可视化和表征自旋波传播。预期的结果将不仅使我们能够获得特定的非线性自旋波过程的基本信息，但将有助于更深入地了解一般的非线性波物理领域，以及考虑可能的应用所研究的非线性过程的自旋电子学和磁振子。

The project is a result of a long-term bi- and tri-lateral cooperation of Münster University, TU Kaiserslautern, and St. Petersburg Electrotechnical University, Russia. The main aim of the cooperation is study of various fundamental nonlinear spin-wave phenomena. Here we main-ly focus ourselves on generation of spin-wave single- and multi-solitonic wavepackets with controllable shape, synchronization of spin-wave chaotic oscillations in active rings based on ferromagnetic films and multiferroic layered structures, as well as nonlinear spin-wave modes in metallic magnetic micro- and nanosystems with low damping confined in the two lateral dimensions driven by spin currents, A simultaneous study of both active and passive magnetic systems allows us a comprehensive investigation of a wide variety of effects that belong to the most modern directions of magnetism. The experiments will be carried out us-ing several complementary techniques, namely, traditional and traveling-wave microwave spectroscopy, as well as time-, space-, and phase-resolved Brillouin light scattering spec-troscopy, including the unique near-field BLS spectrometer, allowing for two-dimensional spatial visualization and characterization of spin-wave propagation. The expected results will not only allow us to obtain fundamental information on specific nonlinear spin-wave process-es but will contribute to a deeper understanding of the field of nonlinear wave physics in general, as well as to consider possible applications of the investigated nonlinear processes for spintronics and magnonics.