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Open AccessArticle

High Frequency Hysteresis Losses on γ-Fe2O3 and Fe3O4: Susceptibility as a Magnetic Stamp for Chain Formation

1
Instituto de Magnetismo Aplicado (UCM-ADIF-CSIC), P.O. Box 155, Las Rozas, 28230 Madrid, Spain
2
Instituto de Ciencia de Materiales de Madrid/CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
3
Université de Toulouse, INSA, UPS, Laboratoire de Physique et Chimie des Nano-Objets (LPCNO), 135 Avenue de Rangueil, F-31077 Toulouse, France and CNRS, UMR 5215, LPCNO, F-31077 Toulouse, France
4
Departamento de Física de Materiales, Universidad Complutense de Madrid, 28048 Madrid, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 970; https://doi.org/10.3390/nano8120970
Received: 21 October 2018 / Revised: 10 November 2018 / Accepted: 21 November 2018 / Published: 24 November 2018
(This article belongs to the Collection Applications of Magnetic Nanomaterials)
In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe2O3 and Fe3O4 nanoparticles has been done. High-frequency hysteresis loops at 50 kHz carried out on particles with sizes ranging from 6 to 350 nm show susceptibility χ increases from 9 to 40 for large particles and it is almost field independent for the smaller ones. This suggests that the applied field induces chain ordering in large particles but not in the smaller ones due to the competition between thermal and dipolar energy. The specific absorption rate (SAR) calculated from hysteresis losses at 60 mT and 50 kHz ranges from 30 to 360 W/gFe, depending on particle size, and the highest values correspond to particles ordered in chains. This enhanced heating efficiency is not a consequence of the intrinsic properties like saturation magnetization or anisotropy field but to the spatial arrangement of the particles. View Full-Text
Keywords: hyperthermia; magnetic nanoparticles; specific absorption rate; iron oxide hyperthermia; magnetic nanoparticles; specific absorption rate; iron oxide
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MDPI and ACS Style

Morales, I.; Costo, R.; Mille, N.; Da Silva, G.B.; Carrey, J.; Hernando, A.; De la Presa, P. High Frequency Hysteresis Losses on γ-Fe2O3 and Fe3O4: Susceptibility as a Magnetic Stamp for Chain Formation. Nanomaterials 2018, 8, 970.

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