磁性材料的磁状态受超快激光脉冲激发而产生翻转的效应称为全光翻转效应，其具有翻转速度快、能量消耗低等优点，是未来数据高速、低功耗写入存储的一种重要手段。当前学术界在自旋电子全光翻转机理方面仍存在争论，争论焦点集中在翻转的机制中逆法拉第效应的贡献。针对这一问题，本项目以空间结构矢量光场丰富的焦场特性为牵引，开展可控光致磁化场的产生及其调控自旋电子全光翻转研究，综合考虑光场与自旋电子相互作用中涉及的相关物理过程，将光场特征、焦场特性、逆法拉第等效磁化场及自旋动力学过程等方面结合起来，深入、系统地研究逆法拉第效应在自旋电子全光翻转中的作用，完善自旋电子全光翻转机理，为研制新型自旋存储芯片，实现数据高速、低功耗的自旋存储技术奠定基础。

All Optical Switching (AOS) refers to the switching of magnetic states induced by ultrafast laser pulses. Thanks to the high switching speed and low energy consumption, AOS is viewed as one of the potential magnetic recording technologies. At present, the microscopic mechanism of AOS has become a subject of debate, and one of the mechanisms proposed to explain AOS is the inverse Faraday effect (IFE). Although IFE has been proposed as the mechanism for AOS for ferromagnetic metals, a rigorous theory for IFE in metals is still under development. To clarify the discussion, in this project, with the help of vectorial optical fields, the IFE is surveyed. We study the AOS of a ferromagnetic metal by a controllable magnetization generated by vectorial optical fields. The input vectorial optical fields, its focus property, the magnetization induced by the IFE, and ultrafast magnetization dynamics of the ferromagnetic metal analyzed through a systematic study. After these studies, the mechanisms of AOS and the role of the IFE will be clarified. Comprehensive understanding of the underlying physical mechanisms will help to design better the magnetic recording technique based on AOS, which paves the way for future high speed and low energy-consumption information storage technology.