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Synthesis of sandwiched composite nanomagnets by epitaxial growth of Fe3O4 layers on SrFe10Cr2O19 nanoplates in high-boiling organic solvent
Date
2022
Abstract
Herein, we demonstrate the synthesis of sandwiched composite nanomagnets, which consist of hard magnetic Cr-substituted hexaferrite cores and magnetite outer layers. The hexaferrite plate-like nanoparticles, with average dimensions of 36.3 nm × 5.2 nm, were prepared via a glass crystallization method and were covered by spinel-type iron oxide via thermal decomposition of iron acetylacetonate in a hexadecane solution. The hexaferrite nanoplates act as seeds for the epitaxial growth of the magnetite, which results in uniform continuous outer layers on both sides. The thickness of the layers can be adjusted by controlling the concentration of metal ions. In this way, layers with an average thickness of 3.7 and 4.9 nm were obtained. Due to an atomically smooth interface, the magnetic composites demonstrate the exchange coupling effect, acting as single phases during remagnetization. The developed approach can be applied to any spinel-type material with matching lattice parameters and opens the way to expand the performance of hexaferrite nanomagnets due to a combination of various functional properties.
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Description
Publisher
MDPI
Citation
Nanomaterials, 13, 167
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Funding Information
The magnetic measurements were carried out thanks to the P220 program of Government of Russia (project № 075-15-2021-604). TEM instrumentation JEOL 2100F TEM usage by Vasily Lebedev has been provided by the INSPIRE programme (Irish Government’s Programme for Research in Third Level Institutions, Cycle 4, National Development Plan 2007-2013); TEM instrumentation Titan Themis Z TEM usage by Anatolii V. Morozov has been provided by Advanced Imaging Core Facilities at Skoltech. The research was carried out using the equipment of MSU Shared Research Equipment Centre «Technologies for obtaining new nanostructured materials and their complex study» and purchased by Lomonosov MSU in the frame of the Equipment Renovation Program (National Project «Science») and in the frame of the Lomonosov MSU Program of Development.