Dynamic force spectroscopy across an individual strongly pinned vortex in a single crystal
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(Color online) (a) A typical MFM image of vortices obtained at . Spectroscopy data were obtained along the solid line across a strongly pinned vortex in the image. In the zoomed image shown in the inset of (a), each spectroscopy site is marked as dots. The site marked as A, B, and C represents the leftmost, central, and rightmost position among the spectroscopy points, respectively. (b) curves obtained on A, B, and C sites. (c) plots converted from data shown in (b). Image parameters: , , , ,
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(a) Gray scale contour plot of the tip–sample interaction energy. The energy values are plotted as a function of the lateral tip position across the vortex (horizontal axis, ) and with the tip–sample separation (vertical axis, ). Several identical energy values are connected with a solid line to show the contour. (b) Visualization of the potential well due to the attractive interaction between tip and vortex for tip–sample separations of 118, 68, and , respectively. Each potential profile is shifted by for a better visualization. (c) Plot of the lateral force at a tip–sample separation of . The lateral force has a maximum value of at about away from the vortex center.
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