Stoichiometry and orientation- and shape-mediated switching field enhancement of the heating properties of Fe3 O4 circular nanodiscs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F21%3A73610914" target="_blank" >RIV/61989592:15640/21:73610914 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.15.014056" target="_blank" >https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.15.014056</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevApplied.15.014056" target="_blank" >10.1103/PhysRevApplied.15.014056</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stoichiometry and orientation- and shape-mediated switching field enhancement of the heating properties of Fe3 O4 circular nanodiscs

Popis výsledku v původním jazyce

The generation of topological magnetic vortex-domain structures in iron-oxide nanomaterials has promising applications in biomedical scenarios, such as heat generators for hyperthermia treatments. In this report we describe alternative kinds of magnetic-vortex nanoparticles, circular Fe nanodiscs (NDs), and dissect their heating properties by in-depth investigation of their shape and size, stoichiometry, orientations, and switching field &quot;H&quot; behaviors, through experiments and theoretical simulation. We find that the stoichiometric NDs show better heating performance than nonstoichiometric materials because of the significant electron hopping between Feand Fe ion. The higher heating efficiency (in terms of specific absorption rate, SAR) is observed only for the higher switching field regime, an effect that is associated with the parallel and perpendicular alignment of nanodiscs with respect to low and high ac magnetic field, respectively. A higher SAR of approximately 270 W/g is observed at a higher switching field (approximately 700 Oe) for NDs of diameter 770 nm, which increases by a factor of 4 at a switching field of approximately 360 Oe for NDs of diameter 200 nm. The reported results suggest that the heating efficiency in these systems can be enhanced by controlling the switching field, which is, in turn, tuned by size, shape, and orientation of circular magnetic vortex nanodiscs.

Název v anglickém jazyce

Stoichiometry and orientation- and shape-mediated switching field enhancement of the heating properties of Fe3 O4 circular nanodiscs

Popis výsledku anglicky

The generation of topological magnetic vortex-domain structures in iron-oxide nanomaterials has promising applications in biomedical scenarios, such as heat generators for hyperthermia treatments. In this report we describe alternative kinds of magnetic-vortex nanoparticles, circular Fe nanodiscs (NDs), and dissect their heating properties by in-depth investigation of their shape and size, stoichiometry, orientations, and switching field &quot;H&quot; behaviors, through experiments and theoretical simulation. We find that the stoichiometric NDs show better heating performance than nonstoichiometric materials because of the significant electron hopping between Feand Fe ion. The higher heating efficiency (in terms of specific absorption rate, SAR) is observed only for the higher switching field regime, an effect that is associated with the parallel and perpendicular alignment of nanodiscs with respect to low and high ac magnetic field, respectively. A higher SAR of approximately 270 W/g is observed at a higher switching field (approximately 700 Oe) for NDs of diameter 770 nm, which increases by a factor of 4 at a switching field of approximately 360 Oe for NDs of diameter 200 nm. The reported results suggest that the heating efficiency in these systems can be enhanced by controlling the switching field, which is, in turn, tuned by size, shape, and orientation of circular magnetic vortex nanodiscs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

<a href="/cs/project/EF17_048%2F0007323" target="_blank" >EF17_048/0007323: Rozvoj předaplikačního výzkumu v oblasti nano- a biotechnologií</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review Applied

ISSN

2331-7019

e-ISSN

—

Svazek periodika

15

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

"nečíslováno"

Kód UT WoS článku

000612682800003

EID výsledku v databázi Scopus

2-s2.0-85100371831