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. 2018 Nov 24;8(12):970. doi: 10.3390/nano8120970

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Comparison of magnetization at 60 mT for ac- (black) and dc- (red) measurements in (A) γFe₂O₃-12nm , and (B) Fe₃O₄-35nm samples. (Note: The dc-hysteresis curves were measured at 250 K).