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. 2021 Oct 9;19:308. doi: 10.1186/s12951-021-01052-7

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — The magnetic physiognomies and composition differences between FePt NPs and FePt@MMT. a The related magnetic properties were conducted with a vibrating sample magnetometer and the hysteresis curves analysis of FePt and FePt@MMT. Its magnetic properties were 16,000 Oe to − 16,000 Oe. Hysteresis curves of different proportions of MMT-modified CTAB synthesis series were added. Its magnetic behavior is paramagnetic. b VSM quantized values. The inflection point of FePt@MMT was about 10.5%. c The T2-weighted MRI contrast images of FePt and FePt@MMT/10.5%. MRI-related analysis, including T2-weighted imaging and 1/T2 linear regression between d FePt NPs and e FePt@MMT nanocomposites