克尔显微镜中的选择性灵敏度。

Selective sensitivity in Kerr microscopy.

作者信息

Soldatov I V, Schäfer R

机构信息

Institute for Metallic Materials, Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany and Institute of Natural Sciences, Ural Federal University, 620002 Ekaterinburg, Russia.

Institute for Metallic Materials, Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany and Institute for Materials Science, TU Dresden, 01062 Dresden, Germany.

出版信息

Rev Sci Instrum. 2017 Jul;88(7):073701. doi: 10.1063/1.4991820.

DOI:10.1063/1.4991820

PMID:28764508

Abstract

A new technique for contrast separation in wide-field magneto-optical Kerr microscopy is introduced. Utilizing the light from eight light emitting diodes, guided to the microscope by glass fibers and being switched synchronously with the camera exposure, domain images with orthogonal in-plane sensitivity can be displayed simultaneously at real-time, and images with pure in-plane or polar contrast can be obtained. The benefit of this new method of contrast separation is demonstrated for Permalloy films, a NdFeB sinter magnet, and a cobalt crystal. Moreover, the new technique is shown to strongly enhance the sensitivity of Kerr microscopy by eliminating parasitic contrast contributions occurring in conventional setups. A doubling of the in-plane domain contrast and a sensitivity to Kerr rotations as low as 0.6 mdeg is demonstrated.

摘要

介绍了一种用于宽场磁光克尔显微镜中对比度分离的新技术。利用来自八个发光二极管的光，通过玻璃纤维引导至显微镜并与相机曝光同步切换，可以实时同时显示具有正交面内灵敏度的畴图像，并获得具有纯面内或极性对比度的图像。这种新的对比度分离方法的优势在坡莫合金薄膜、钕铁硼烧结磁体和钴晶体中得到了证明。此外，新技术通过消除传统设置中出现的寄生对比度贡献，极大地提高了克尔显微镜的灵敏度。展示了面内畴对比度提高一倍以及对低至0.6毫度的克尔旋转的灵敏度。