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Magnetic Vortex and Hyperthermia Suppression in Multigrain Iron Oxide Nanorings

Abstract: 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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Appl. Sci. 2020, 10(3), 787

Editorial: MDPI

 Fecha de publicación: 01/02/2020

Nº de páginas: 11

Tipo de publicación: Artículo de Revista

 DOI: 10.3390/app10030787

ISSN: 2076-3417

Url de la publicación: https://doi.org/10.3390/app10030787

Autores/as

DAS, RAJA

WITANACHCHI, CHIRAN

NEMATI, ZOHREH

KALAPPATTIL, VIJAYSANKAR

RODRIGO, IRATI

GARCÍA, JOSÉ ÁNGEL

GARAIO, ENEKO

LAM, VU DINH

LE, ANH-TUAN

PHAN, MANH-HUONG

SRIKANTH, HARIHARAN