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. 2017 Sep 7;7:10919. doi: 10.1038/s41598-017-11279-w

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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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(a,b) The hysteresis loop of MNPs with d = 150–350 nm and l = 200 nm and 500 nm, respectively. (c,d) The low field magnetic susceptibility (χ) and magnetization M_r/M_s was obtained as a function of MNP d = 150–350 nm and l = 50–500 nm for both single vortex state (dashed lines) and triple vortex state (solid lines). (e) The force exerted by MNPs with respect to applied magnetic field for d = 150–350 nm and l = 50–500 nm. (f) The comparison of cell viability of HeLa cells after magneto-mechanical cell destruction treatment using MNPs with d = 150–350 nm and l = 500 nm.