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Open AccessArticle

Magnetic Vortex and Hyperthermia Suppression in Multigrain Iron Oxide Nanorings

1
Faculty of Materials Science and Engineering and Phenikaa Institute for Advanced Study (PIAS), Phenikaa University, Hanoi 10000, Vietnam
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Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Vietnam
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Department of Physics, University of South Florida, Tampa, Tampa, FL 33620, USA
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BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
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Depto. de Física Aplicada II, Universidad del País Vasco (UPV/EHU), 48940 Leioa, Spain
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Departamiento de Ciencias, Universidad Pública de Navarra (UPN), 31006 Pamplona, Spain
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Depto CITIMAC, Universidad de Cantabria, 39005 Santander, Spain
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Gradduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology, Hoang Quoc Viet 18, Ha Noi, Vietnam
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Phenikaa University Nano Institute (PHENA), Phenikaa University, Hanoi 12116, Vietnam
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Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(3), 787; https://doi.org/10.3390/app10030787
Received: 13 December 2019 / Revised: 15 January 2020 / Accepted: 18 January 2020 / Published: 22 January 2020
(This article belongs to the Section Nanotechnology and Applied Nanosciences)
Single-crystal iron oxide nanorings have been proposed as a promising candidate for magnetic hyperthermia application because of their unique shape-induced vortex-domain structure, which supports good colloidal stability and enhanced magnetic properties. However, the synthesis of single crystalline iron oxide has proven to be challenging. In this article, we showed that chemically synthesized multigrain magnetite nanorings disfavor a shape-induced magnetic vortex-domain structure. Our results indicate that the multigrain Fe3O4 nanorings with an average outer diameter of ~110 nm and an inner to outer diameter ratio of ~0.5 do not show a shape-induced vortex-domain structure, which was observed in the single-crystal Fe3O4 nanorings of similar dimensions. At 300 Ks, multigrain magnetite nanorings showed an effective anisotropy field of 440 Oe, which can be attributed to its high surface area and intraparticle interaction. Both calorimetric and AC loop measurements showed a moderate inductive heating efficiency of multigrain magnetite nanorings of ~300 W/g at 800 Oe. Our results shed light on the magnetic ground states of chemically synthesized multigrain Fe3O4 nanorings. View Full-Text
Keywords: multigrain; nanorings; magnetic vortex-domain; hyperthermia multigrain; nanorings; magnetic vortex-domain; hyperthermia
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MDPI and ACS Style

Das, R.; Witanachchi, C.; Nemati, Z.; Kalappattil, V.; Rodrigo, I.; García, J.Á.; Garaio, E.; Alonso, J.; Lam, V.D.; Le, A.-T.; Phan, M.-H.; Srikanth, H. Magnetic Vortex and Hyperthermia Suppression in Multigrain Iron Oxide Nanorings. Appl. Sci. 2020, 10, 787. https://doi.org/10.3390/app10030787

AMA Style

Das R, Witanachchi C, Nemati Z, Kalappattil V, Rodrigo I, García JÁ, Garaio E, Alonso J, Lam VD, Le A-T, Phan M-H, Srikanth H. Magnetic Vortex and Hyperthermia Suppression in Multigrain Iron Oxide Nanorings. Applied Sciences. 2020; 10(3):787. https://doi.org/10.3390/app10030787

Chicago/Turabian Style

Das, Raja; Witanachchi, Chiran; Nemati, Zohreh; Kalappattil, Vijaysankar; Rodrigo, Irati; García, José Á.; Garaio, Eneko; Alonso, Javier; Lam, Vu D.; Le, Anh-Tuan; Phan, Manh-Huong; Srikanth, Hariharan. 2020. "Magnetic Vortex and Hyperthermia Suppression in Multigrain Iron Oxide Nanorings" Appl. Sci. 10, no. 3: 787. https://doi.org/10.3390/app10030787

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