论文标题
磁性螺旋二色性在磁涡流反射中
Magnetic helicoidal dichroism in reflection by magnetic vortices
论文作者
论文摘要
在过去的十年中，识别和成像越来越复杂的磁性结构的自旋纹理已成为一个重大挑战，尤其是在Ultrashort TimeScales。当前的大多数方法基于对它们的极化和磁化依赖性反射率的分析。根据我们的联合出版物xxx xx xxxxxx，我们引入了一个不同的概念，以磁性结构与带有轨道角动量（OAM）的光束耦合。在通过磁性涡流反射后，具有独特值$ \ ell $ OAM的传入光束会在附近的OAM模式中富集$ \ ell \ pm 1 $。它产生各向异性远场图像，该图像被识别为磁性螺旋二色性（MHD）信号。他们的分析允许以极好的精度检索复杂的磁光线常数。这种方法不需要任何偏振分析分析，它有望快速识别自旋纹理，包括以四秒表至二秒时间的分辨率。
Identifying and imaging spin textures of ever more complex magnetic structures has become a major challenge in the past decade, especially at ultrashort timescales. Most of current approaches are based on the analysis of their polarization and magnetization-dependent reflectivities. Based on our joint publication XXX XX XXXXXX, we introduce a different concept, centered on the coupling of magnetic structures with light beams carrying orbital angular momentum (OAM). Upon reflection by a magnetic vortex, an incoming beam with a unique value $\ell$ of OAM gets enriched in the neighboring OAM modes $\ell\pm 1$. It results in anisotropic far-field images, which are identified as a Magnetic Helicoidal Dichroism (MHD) signal. Their analysis allow to retrieve the complex magneto-optical constants with excellent precision. This method, which does not require any polarization-resolved analysis, is promising for a quick identification of spin textures, including with attosecond to femtosecond time resolutions.
