Počet záznamů: 1
Understanding particle size and distance driven competition of interparticle interactions and effective single-particle anisotropy
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SYSNO ASEP 0460558 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Understanding particle size and distance driven competition of interparticle interactions and effective single-particle anisotropy Tvůrce(i) Pacáková, Barbara (FZU-D) RID, ORCID
Mantlíková, Alice (FZU-D) RID
Nižňanský, D. (CZ)
Kubíčková, Simona (FZU-D) RID
Vejpravová, Jana (FZU-D) RID, ORCIDČíslo článku 206004 Zdroj.dok. Journal of Physics-Condensed Matter. - : Institute of Physics Publishing - ISSN 0953-8984
Roč. 28, č. 20 (2016), 1-11Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova magnetic nanoparticles ; single-particle anisotropy ; dipolar energy Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GA15-01953S GA ČR - Grantová agentura ČR Institucionální podpora FZU-D - RVO:68378271 UT WOS 000376409000010 EID SCOPUS 84969931508 DOI 10.1088/0953-8984/28/20/206004 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2017
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