中文摘要：

利用上海光源软X射线谱学显微光束线站（STXM）并结合X射线的磁圆二色效应，我们对方形、圆形和三角形的Ni80Fe20薄膜微结构中的磁涡旋结构进行了定量实验观测，并利用同步辐射光源的元素分辨特性，分别在Fe和Ni的L3吸收边对涡旋磁结构进行了观测。我们还对磁涡旋中磁矩的分布进行了定量分析，发现实验结果与微磁学模拟结果完全符合。

英文摘要：

Magnetic recording has now played an important role in the development of non-volatile information storage tech-nologies, so it becomes essential to quantitatively understand the magnetization distribution in magnetic microstructures. In ferromagnetic disks, squares and triangles with submicron sizes, it is energetically favorable for the magnetization to form a closed in-plane vortex and a perpendicular vortex core at the center. This vortex magnetic structure is a new candidate for future magnetic memory device because both the vortex chirality and the core polarity can be manipulated by applying an external magnetic field or a spin-polarized current. Further development of vortex-based memory devices requires quantitative measurement of vortex domain structures, which is still lacking. 〈br〉 In this paper, magnetization configuration in a vortex structure has been quantitatively studied by scanning trans-mission X-ray microscope （STXM） utilizing X-ray magnetic circular dichroism （XMCD） effect in Shanghai Synchrotron Radiation Facility. Samples have been fabricated on the 100 nm silicon-nitride membranes. The patterns are first transferred to PMMA photoresist using e-beam lithography, then a 50 nm thick Ni80Fe20 film is deposited by e-beam evaporation. Magnetic vortex configurations are characterized with the X-ray energy at Fe L3 absorption edge and Ni L3 absorption edge, respectively. The image taken at Fe edge shows greater contrast than that at Ni edge. Experimental results indicate that the magnetic vortex state remains stable in permalloy circle, square and triangle structures with diameters from 2 to 5 μm. The STXM images indicate that the magnetization in circular geometry changes continuously along the concentric circles without clear domain boundaries. In contrast, magnetization in square geometry consists of four distinct domains with clear diagonal domain boundaries. Similarly, three domains can be observed in triangle geometry. In order to quantify the in-plane magnetization configurati