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. 2016 Nov 15;6:36847. doi: 10.1038/srep36847

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article’sCreative Commons license, unless indicated otherwise in the credit line; if the material is not included under theCreative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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(a) Cartoon of stray fields (H_S) at the edges of Py stripes (brown) on top of the Nb film (blue). Vortices induced in the Nb film by H_S during the field-cooling (from T > T_C to T < T_C) are shown by yellow arrows and vortices induced by the field H_Z applied perpendicular to the Nb film at T < Tc are shown as green arrows. Distribution of magnetic charges for the in-plane polarization of Py stripes across (b) and along (c) their length (top view). For Hz induced vortices, the positively charged edges of the Py stripes act as lines of logarithmically diverging repelling potential barriers U₊ while along the negatively charged edges they become attractive potential valleys U₋.