Bad neighbour, good neighbour: how magnetic dipole interactions between soft and hard ferrimagnetic nanoparticles affect macroscopic magnetic properties in ferrofluids

Fluids responding to magnetic fields (ferrofluids) offer a scene with no equivalent in nature to explore long-range magnetic dipole interactions. Here, we studied the very original class of binary ferrofluids, embedding soft and hard ferrimagnetic nanoparticles. We used a combination of X-ray magnet...

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Bibliographic Details
Published in:Nanoscale 2020-05, Vol.12 (2), p.11222-11231
Main Authors: Daffé, Niéli, Ze evi, Jovana, Trohidou, Kalliopi N, Sikora, Marcin, Rovezzi, Mauro, Carvallo, Claire, Vasilakaki, Marianna, Neveu, Sophie, Meeldijk, Johannes D, Bouldi, Nadejda, Gavrilov, Véronica, Guyodo, Yohan, Choueikani, Fadi, Dupuis, Vincent, Taverna, Dario, Sainctavit, Philippe, Juhin, Amélie
Format: Article
Language:English
Subjects:
Binary mixtures
Coercivity
Computer simulation
Condensed Matter
Dipole interactions
Ferrimagnetism
Ferrofluids
Hysteresis
Magnetic dipoles
Magnetic fluids
Magnetic properties
Magnetic spectroscopy
Magnetism
Monte Carlo simulation
Multiscale analysis
Nanoparticles
Physics
Spectrum analysis
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Summary:Fluids responding to magnetic fields (ferrofluids) offer a scene with no equivalent in nature to explore long-range magnetic dipole interactions. Here, we studied the very original class of binary ferrofluids, embedding soft and hard ferrimagnetic nanoparticles. We used a combination of X-ray magnetic spectroscopy measurements supported by multi-scale experimental techniques and Monte-Carlo simulations to unveil the origin of the emergent macroscopic magnetic properties of the binary mixture. We found that the association of soft and hard magnetic nanoparticles in the fluid has a considerable influence on their inherent magnetic properties. While the ferrofluid remains in a single phase, magnetic interactions at the nanoscale between both types of particles induce a modification of their respective coercive fields. By connecting the microscopic properties of binary ferrofluids containing small particles, our findings lay the groundwork for the manipulation of magnetic interactions between particles at the nanometer scale in magnetic liquids. Hard ferrimagnetic CoFe 2 O 4 nanoparticles become softer in the presence of neighbouring soft ferrimagnetic MnFe 2 O 4 nanoparticles.
ISSN:2040-3364
2040-3372
DOI:10.1039/d0nr02023k