Understanding particle size and distance driven competition of interparticle interactions and effective single-particle anisotropy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00460558" target="_blank" >RIV/68378271:_____/16:00460558 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/16:10331103

Výsledek na webu

<a href="http://dx.doi.org/10.1088/0953-8984/28/20/206004" target="_blank" >http://dx.doi.org/10.1088/0953-8984/28/20/206004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0953-8984/28/20/206004" target="_blank" >10.1088/0953-8984/28/20/206004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Understanding particle size and distance driven competition of interparticle interactions and effective single-particle anisotropy

Popis výsledku v původním jazyce

Magnetic response of single-domain nanoparticles (NPs) in concentrated systems is strongly affected by mutual interparticle interactions. However, particle proximity significantly influences the single-particle effective anisotropy. To solve which of these two phenomena plays a dominant role in the magnetic response of real NP systems, systematic study on the samples with well-defined parameters is required. In our work, we prepared a series of nanocomposites constituted of highly- crystalline and well-isolated CoFe2O4 NPs embedded in an amorphous SiO2 matrix using a single-molecule precursor method. This preparation method enabled us to reach a wide interval of particle size and concentration. We observed that the characteristic parameters of the single-domain state (coercivity, blocking temperature) and dipole-dipole interaction energy (Ed-d) were proportional with each other. Our results are in excellent agreement with the Monte-Carlo simulations of particle growth. Therefore, the concept of modified NP effective anisotropy explains the magnetic response of our concentrated NP systems better than the concept of an energy barrier influenced by nterparticle interactions.

Název v anglickém jazyce

Understanding particle size and distance driven competition of interparticle interactions and effective single-particle anisotropy

Popis výsledku anglicky

Magnetic response of single-domain nanoparticles (NPs) in concentrated systems is strongly affected by mutual interparticle interactions. However, particle proximity significantly influences the single-particle effective anisotropy. To solve which of these two phenomena plays a dominant role in the magnetic response of real NP systems, systematic study on the samples with well-defined parameters is required. In our work, we prepared a series of nanocomposites constituted of highly- crystalline and well-isolated CoFe2O4 NPs embedded in an amorphous SiO2 matrix using a single-molecule precursor method. This preparation method enabled us to reach a wide interval of particle size and concentration. We observed that the characteristic parameters of the single-domain state (coercivity, blocking temperature) and dipole-dipole interaction energy (Ed-d) were proportional with each other. Our results are in excellent agreement with the Monte-Carlo simulations of particle growth. Therefore, the concept of modified NP effective anisotropy explains the magnetic response of our concentrated NP systems better than the concept of an energy barrier influenced by nterparticle interactions.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GA15-01953S" target="_blank" >GA15-01953S: Nanokompozitní systémy plasmonických/magnetických nanočástic - grafenu - aromatických molekul pro zesílené Ramanské procesy</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics-Condensed Matter

ISSN

0953-8984

e-ISSN

—

Svazek periodika

28

Číslo periodika v rámci svazku

20

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

—

Kód UT WoS článku

000376409000010

EID výsledku v databázi Scopus

2-s2.0-84969931508