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. 2019 Mar 12;9:4185. doi: 10.1038/s41598-019-40769-2

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© The Author(s) 2019

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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In vitro SPA as a function of field amplitude H₀ (f = 571 kHz) for a) PEI-Fe₃O₄ NPs (open squares) and Au-PEI-Fe₃O₄ (solid circles) nanoparticles within BV2 cells. Dotted lines correspond to the best fit of the data using a power law $SPA = H^{λ}$ (see text).