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Title: Magnetic Vortex and Hyperthermia Suppression in Multigrain Iron Oxide Nanorings

Journal Article · · Applied Sciences
 [1];  [2];  [2];  [2];  [3];  [4];  [5]; ORCiD logo [6];  [7];  [8];  [2];  [2]
  1. Phenikaa Univ., Hanoi (Vietnam). Faculty of Materials Science and Engineering and Phenikaa Institute for Advanced Study (PIAS); Phenikaa Research and Technology Institute (PRATI), Hanoi (Vietnam); OSTI
  2. Univ. of South Florida, Tampa, FL (United States). Dept. of Physics
  3. BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, Leioa (Spain)
  4. BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, Leioa (Spain); Universidad del País Vasco (UPV/EHU), Leioa (Spain). Depto. de Física Aplicada II
  5. Universidad del País Vasco (UPV/EHU), Leioa (Spain). Depto. de Física Aplicada II; Universidad Pública de Navarra (UPN), Pamplona (Spain). Departamiento de Ciencias
  6. Univ. of South Florida, Tampa, FL (United States). Dept. of Physics; Universidad de Cantabria, Santander (Spain). Depto CITIMAC
  7. Graduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology, Hanoi (Vietnam)
  8. Phenikaa University, Hanoi (Vietnam). Phenikaa University Nano Institute (PHENA)

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.

Research Organization:
Univ. of South Florida, Tampa, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
FG02-07ER46438
OSTI ID:
1800503
Journal Information:
Applied Sciences, Journal Name: Applied Sciences Journal Issue: 3 Vol. 10; ISSN 2076-3417; ISSN ASPCC7
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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