Size dependence of the surface spin disorder and surface anisotropy constant in ferrite nanoparticles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F23%3A00575070" target="_blank" >RIV/61389013:_____/23:00575070 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/23:10467041 RIV/00216208:11320/23:10467041

Výsledek na webu

<a href="https://pubs.rsc.org/en/content/articlelanding/2023/NA/D3NA00266G" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2023/NA/D3NA00266G</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/D3NA00266G" target="_blank" >10.1039/D3NA00266G</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Size dependence of the surface spin disorder and surface anisotropy constant in ferrite nanoparticles

Popis výsledku v původním jazyce

The magnetic properties of nanoscale magnets are greatly influenced by surface anisotropy. So far, its quantification is based on the examination of the blocking temperature shift within a series of nanoparticles of varying sizes. In this scenario, the surface anisotropy is assumed to be a particle size-independent quantity. However, there is no solid experimental proof to support this simplified picture. On the contrary, our work unravels the size-dependent magnetic morphology and surface anisotropy in highly uniform magnetic nanoparticles using small-angle polarized neutron scattering. We observed that the surface anisotropy constant does not depend on the nanoparticle's size in the range of 3–9 nm. Furthermore, our results demonstrate that the surface spins are less prone to polarization with increasing nanoparticle size. Our study thus proves the size dependence of the surface spin disorder and the surface anisotropy constant in fine nanomagnets. These findings open new routes in materials based on a controlled surface spin disorder, which is essential for future applications of nanomagnets in biomedicine and magnonics.

Název v anglickém jazyce

Size dependence of the surface spin disorder and surface anisotropy constant in ferrite nanoparticles

Popis výsledku anglicky

The magnetic properties of nanoscale magnets are greatly influenced by surface anisotropy. So far, its quantification is based on the examination of the blocking temperature shift within a series of nanoparticles of varying sizes. In this scenario, the surface anisotropy is assumed to be a particle size-independent quantity. However, there is no solid experimental proof to support this simplified picture. On the contrary, our work unravels the size-dependent magnetic morphology and surface anisotropy in highly uniform magnetic nanoparticles using small-angle polarized neutron scattering. We observed that the surface anisotropy constant does not depend on the nanoparticle's size in the range of 3–9 nm. Furthermore, our results demonstrate that the surface spins are less prone to polarization with increasing nanoparticle size. Our study thus proves the size dependence of the surface spin disorder and the surface anisotropy constant in fine nanomagnets. These findings open new routes in materials based on a controlled surface spin disorder, which is essential for future applications of nanomagnets in biomedicine and magnonics.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/LL2104" target="_blank" >LL2104: Od nano-úrovně po atomové inženýrství kyselých center pro selektivní heterogenní katalýzu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Nanoscale Advances

ISSN

2516-0230

e-ISSN

2516-0230

Svazek periodika

5

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

4563-4570

Kód UT WoS článku

001047744000001

EID výsledku v databázi Scopus

2-s2.0-85168836635