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(a) Photography of the ring probe made of -wide tungsten wire, (b) schematics of the parallel magnetizations of the sample and iron film coated on the ring tip, and (c) Kerr hysteresis loop for the field applied parallel to the ring plane.
(Color online) (a) STM constant current image of 6.8 ML with feedback parameters of , , and (b) its current map at . Line profiles along the black dashed lines in (a) and (b) are shown in (c).
spectra, averaged over the sixth and seventh layers, respectively, with their numerically differentiated conductance spectra shown in the lower part. The seventh layer has larger current than the sixth layer over the whole voltage range.
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