Magnetic Vortex and Hyperthermia Suppression in Multigrain Iron Oxide Nanorings

Applied Sciences

JoséÁngel García¹  Irati Rodrigo¹  Manh-Huong Phan²  Hariharan Srikanth²  Javier Alonso²  Zohreh Nemati²  Vijaysankar Kalappattil²  Chiran Witanachchi²  Eneko Garaio³  Raja Das⁴  VuDinh Lam⁵  Anh-Tuan Le⁶ 

[1] BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain;Department of Physics, University of South Florida, Tampa, Tampa, FL 33620, USA;Depto. de Física Aplicada II, Universidad del País Vasco (UPV/EHU), 48940 Leioa, Spain;Faculty of Materials Science and Engineering and Phenikaa Institute for Advanced Study (PIAS), Phenikaa University, Hanoi 10000, Vietnam;Gradduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology, Hoang Quoc Viet 18, Ha Noi, Vietnam;Phenikaa University Nano Institute (PHENA), Phenikaa University, Hanoi 12116, Vietnam;

关键词: multigrain;    nanorings;    magnetic vortex-domain;    hyperthermia;   

DOI  :  10.3390/app10030787

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown