Scanning near-field optical microscopy as a new tool for subwavelength-resolution magnetooptical investigationsстатья
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Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
Аннотация:This paper reviews the current methods in magnetic imaging by scanning probe microscopy. Special emphasis is made on the application of scanning near-field optical microscopy (SNOM) for the subwavelength-resolution investigation of magnetic structures, as well as the capabilities and other problems of the SNOM technique in magnetooptical studies. The experimental section deals with the application of a homemade SNOM for the local analysis of the Faraday polarization rotation distribution in ferrimagnetic iron-garnet films. Studies performed both in a more conventional illumination mode, as well as in the collection mode, show that SNOM measurements demonstrate polarization properties similar to those of the conventional domain imaging with the Faraday effect. With properly adjusted polarizers. one can separately observe domains with opposite magnetization, as well as domain walls. At the same time, SNOM images of domain walls differ from conventional pictures seen in far-field magnetooptical microscopy. The origin of the detected widening of the domain wall images, as well as the fine features of the image, needs to be verified.