It is demonstrated that it is possible to image magnetic domains with a resolution of better than 60 nm with the Kerr effect in a reflection-mode scanning near-field optical microscope. Images taken of tracks of thermomagnetically prewritten bits in a Co/Pt multilayer structure magnetized out-of plane showed optical features in a track pattern whose appearance was determined by the position of an analyzer in front of the photomultiplier tube. These features were not apparent in the topography, showing this to be a purely magneto-optic effect.
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Durkam, C., Shvets, I. V., & Lodder, J. C. (1997). Observation of magnetic domains using a reflection mode scanning near-field optical microscope. Applied physics letters, 70(10), 1323-1325. https://doi.org/10.1063/1.118524