期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 523, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2020.167585
关键词
Magneto-optical Kerr effect; Vortices; Pinning
The study demonstrates a magneto-optical microscopy technique to observe the pinning behavior of a vortex state in a magnetic film, revealing the trapping effect of defects and inhomogeneities on high-energy-density magnetization configurations.
We demonstrate a magneto-optical microscopy technique to create two-dimensional images of the pinning behavior of a vortex state as it is translated through a soft ferromagnetic film. The resulting information yields a map of how defects and inhomogeneities in the material serve to trap high-energy-density magnetization configurations such as vortex cores or domain walls. We raster scan a vortex core within a thin permalloy disk using in-plane magnetic fields, and monitor the vortex displacement using the magneto-optical Kerr effect. The differential nature of the measurement yields spatial resolution approximate to 5 nm, much less than the diffraction limit, and minimum resolvable pinning energy approximate to 0.4 eV. The technique produces two images, one displaying the pinning-induced vortex displacement relative to the expected free motion, and the other displaying hysteretic vortex displacement between the trace and re-trace. We demonstrate the technique on two samples, extract quantitative statistics about the pinning landscape, and compare to simulated results with a pinning landscape derived from the measured surface topography of the samples.
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