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. 2020 Jul 20;10:12005. doi: 10.1038/s41598-020-68875-6

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© The Author(s) 2020

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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(Top-left) Temperature dependence of mass magnetic susceptibility at 1kOe for pristine (red curve) and IL-treated (black curve) samples. Blue curve represents the IL-treated curve after subtraction of pristine contribution. The Inset shows pristine χ-curve in an enlarged scale. (Top-right) ZFC and FC magnetic susceptibility for IL-treated sample at 20 Oe. In the Inset FC magnetic susceptibility at 20 Oe (green curve) and at 1 kOe (black curve) are compared. (Bottom) Magnetization as function of H measured at room temperature (bottom-left) and at 5 K (bottom-right) In the Insets an enlargement of the respective curve is reported in the low field region.