Fig. 8
From: Spin-polarized scanning tunneling microscopy with quantitative insights into magnetic probes
(Reprinted from [7] with permission from Nature Publishing Group (Copyright 2014))
In-field spin-STS of a biatomic-layer-high Fe nanoisland with a Stoner-Wohlfarth tip. a CC-STM image of a Fe|Co island on Cu(111). Scale bar is 4 nm long. b Hard sphere model of the atomic stacking in a Fe|Co island. The gray, red, and yellow spheres are the Cu, bottom layer Fe, and top layer Fe, respectively. c dI/dV map of the Fe|Co island shown in a measured at 0 T, where both magnetizations of tip M T and Co core M Co point up (V b = −0.3 V, I set = 3 nA). The island edges and Co core are indicated by the grey and black dashed lines. The stripe patterns in three (1, 2, 3) regions originate from the non-collinear cycloidal spin orders in the bridge-stacked bilayer Fe on Cu(111). The black, red and blue solid lines (arrows) indicate the directions of the stripes (wave vectors of the cycloidal spin orders), in the regions 1, 2 and 3, respectively. d Field-dependence of dI/dV profiles along the arrow 1 in a, measured with the field sweep of 0–1.5 T. e Magnified view of the grey dashed box in d and is shown for a clarity of field-dependent shifts of the location of the maxima in d. The black and purple dotted lines denote the peak positions of the profiles measured at 0 and 1.5 T, respectively