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. 2017 Apr 11;7:833. doi: 10.1038/s41598-017-00837-x

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Magnetic configuration (red = down, blue = up) of a strip for every cycle in the propagation sequence. (a) Domain walls successfully being moved to the right, fields strengths H _x and H _z are 140 mT and 10.4 mT respectively. (b) Domain walls successfully being moved to the right by changing the sign of combined fields, field strengths H _x and H _z are 140 mT and 9.2 mT respectively). (c) In-plane fields (120 mT) are applied transverse to instead of along the strips, H _z = 10.8 mT. (d) Unirradiated strip, field strengths H _x = 150 mT and H _z = 5.0 mT are used. (e) Sample with top Pt layer grown under higher argon pressure, field strengths H _x = 80 mT and H _z = 22.8 mT are used. (f) Sample with top Pt layer replaced by Ir, field strengths H _x = 160 mT and H _z = 8.0 mT are used.