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Disentangling local heat contributions in interacting magnetic nanoparticles

Disentangling local heat contributions in interacting magnetic nanoparticles
Disentangling local heat contributions in interacting magnetic nanoparticles
Recent experiments on magnetic nanoparticle hyperthermia show that the heat dissipated by particles must be considered locally instead of characterizing it as a global quantity. Here we show theoretically that the complex energy transfer between nanoparticles interacting via magnetic dipolar fields can lead to negative local hysteresis loops and does not allow the use of these local hysteresis loops as a temperature measure. Our model shows that interacting nanoparticles release heat not only when the nanoparticle magnetization switches between different energy wells, but also in the intrawell motion, when the effective magnetic field is changed because the magnetization of another particle has switched. The temperature dynamics has a highly nontrivial dependence on the amount of precession, which is controlled by the magnetic damping. Our results constitute a step forward in modeling magnetic nanoparticles for hyperthermia and other heating applications.
2469-9950
Muñoz-Menendez, Cristina
bb119145-ad2a-4878-862f-525aaee7847e
Serantes, David
ac7782c0-f298-4414-98c7-7b3ed4b13a9f
Chubykalo-Fesenko, Oksana
365cd340-901d-4de0-989c-ba50af711716
Ruta, Sergiu
47509d6b-adba-44a3-a2d4-1cac17bf8de7
Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Nieves, Pablo
41c48761-1817-47f1-bac9-4b42672ea343
Livesey, Karen
0a5c4619-c453-45b0-a6a5-538bc298360c
Baldomir, Daniel
af449893-034e-439f-92cb-f6ba475b53f9
Chantrell, Roy W.
e302f8d2-4450-4d1e-a944-50f40e93e7db
Muñoz-Menendez, Cristina
bb119145-ad2a-4878-862f-525aaee7847e
Serantes, David
ac7782c0-f298-4414-98c7-7b3ed4b13a9f
Chubykalo-Fesenko, Oksana
365cd340-901d-4de0-989c-ba50af711716
Ruta, Sergiu
47509d6b-adba-44a3-a2d4-1cac17bf8de7
Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Nieves, Pablo
41c48761-1817-47f1-bac9-4b42672ea343
Livesey, Karen
0a5c4619-c453-45b0-a6a5-538bc298360c
Baldomir, Daniel
af449893-034e-439f-92cb-f6ba475b53f9
Chantrell, Roy W.
e302f8d2-4450-4d1e-a944-50f40e93e7db

Muñoz-Menendez, Cristina, Serantes, David, Chubykalo-Fesenko, Oksana, Ruta, Sergiu, Hovorka, Ondrej, Nieves, Pablo, Livesey, Karen, Baldomir, Daniel and Chantrell, Roy W. (2020) Disentangling local heat contributions in interacting magnetic nanoparticles. Physical Review B, 102 (21), [214412]. (doi:10.1103/PhysRevB.102.214412).

Record type: Article

Abstract

Recent experiments on magnetic nanoparticle hyperthermia show that the heat dissipated by particles must be considered locally instead of characterizing it as a global quantity. Here we show theoretically that the complex energy transfer between nanoparticles interacting via magnetic dipolar fields can lead to negative local hysteresis loops and does not allow the use of these local hysteresis loops as a temperature measure. Our model shows that interacting nanoparticles release heat not only when the nanoparticle magnetization switches between different energy wells, but also in the intrawell motion, when the effective magnetic field is changed because the magnetization of another particle has switched. The temperature dynamics has a highly nontrivial dependence on the amount of precession, which is controlled by the magnetic damping. Our results constitute a step forward in modeling magnetic nanoparticles for hyperthermia and other heating applications.

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PhysRevB.102.214412 - Version of Record
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Accepted/In Press date: 24 November 2020
Published date: 10 December 2020

Identifiers

Local EPrints ID: 450388
URI: http://eprints.soton.ac.uk/id/eprint/450388
ISSN: 2469-9950
PURE UUID: 93a5bcb3-3def-436a-ad2d-d6036c2f2416
ORCID for Ondrej Hovorka: ORCID iD orcid.org/0000-0002-6707-4325

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Date deposited: 27 Jul 2021 16:30
Last modified: 26 Nov 2021 03:01

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Contributors

Author: Cristina Muñoz-Menendez
Author: David Serantes
Author: Oksana Chubykalo-Fesenko
Author: Sergiu Ruta
Author: Ondrej Hovorka ORCID iD
Author: Pablo Nieves
Author: Karen Livesey
Author: Daniel Baldomir
Author: Roy W. Chantrell

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