CNISM-Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
Phys Rev Lett. 2013 Apr 26;110(17):177205. doi: 10.1103/PhysRevLett.110.177205. Epub 2013 Apr 22.
We report the creation and real-space observation of magnetic structures with well-defined topological properties and a lateral size as low as about 150 nm. They are generated in a thin ferrimagnetic film by ultrashort single optical laser pulses. Thanks to their topological properties, such structures can be classified as Skyrmions of a particular type that does not require an externally applied magnetic field for stabilization. Besides Skyrmions, we are able to generate magnetic features with topological characteristics that can be tuned by changing the laser fluence. The stability of such features is accounted for by an analytical model based on the interplay between the exchange and the magnetic dipole-dipole interactions.
我们报告了具有明确拓扑性质和低至约 150nm 横向尺寸的磁结构的创建和实空间观测。它们是通过超短单光学激光脉冲在薄铁磁薄膜中产生的。由于它们的拓扑性质，这些结构可以被分类为不需要外部磁场稳定的特定类型的斯格明子。除了斯格明子，我们还能够通过改变激光通量来生成具有拓扑特征的磁特征，这些特征可以通过改变激光通量来进行调整。这种特征的稳定性是由基于交换和磁偶极-偶极相互作用相互作用的分析模型来解释的。
