Véronica Gavrilov

PHENIX laboratory

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Philippe Sainctavit

Institut de minéralogie, de physique des matériaux et de cosmochimie

Sophie Neveu

Sorbonne Université

Vincent Dupuis

Centre National de la Recherche Scientifique

Amélie Juhin

Institut de minéralogie, de physique des matériaux et de cosmochimie

Fadi Choueikani

Synchrotron soleil

Niéli Daffé

Paul Scherrer Institute

Philippe Ohresser

Synchrotron soleil

Nadejda Bouldi

Heidelberg University

Marcin Sikora

AGH University of Krakow

Mauro Rovezzi

European Synchrotron Radiation Facility

Cooperative Institutions

Centre National de la Recherche Scientifique

Sorbonne Université

Institut de Recherche pour le Développement

Institut de minéralogie, de physique des matériaux et de cosmochimie

Synchrotron soleil

Université Paris Cité

Université Paris-Sud

Institute for Magnetospheric Physics

Délégation Ile-de-France Villejuif

Structure et Instabilité des Génomes

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Interface-driven magnetic anisotropies in a ferrofluid of core-shell nanoparticles

arXiv (Cornell University) (2016)

Niéli Daffé Marcin Sikora Nadejda Bouldi Véronica Gavrilov Sophie Neveu

Magnetic anisotropies in a ferrofluid of core@shell MnFe2O4@CoFe2O4 nanoparticles are studied in the liquid and frozen states using a unique sample cell developed for element specific hard X-ray magnetic spectroscopies. The MnFe2O4@CoFe2O4 6.7 nm particles reveal original magnetic properties, with a gradient in coercive field inside a nanospinel. The very thin (0.35 nm) CoFe2O4 shell is found to impose a strong magnetic anisotropy to the otherwise very soft MnFe2O4 core, so that the inner core presents a large coercive field (0.56 T) and an unexpectedly high remanent magnetization (95% of the saturation magnetization) for such a non-oriented system. The possibility to investigate ferrofluid samples where interparticle interactions have been preserved opens new perspectives in the domain of magnetic liquids.

Ferrofluid

Single domain

Saturation (graph theory)

Domain wall (magnetism)

Source

Cite

Citations (0)

Nanoscale Distribution of Magnetic Anisotropies in Bimagnetic Soft Core–Hard Shell MnFe₂O₄@CoFe₂O₄ Nanoparticles

Advanced Materials Interfaces (2017)

Niéli Daffé Marcin Sikora Mauro Rovezzi Nadejda Bouldi Véronica Gavrilov

Abstract The nanoscale distribution of magnetic anisotropies is measured in core@shell MnFe 2 O 4 @CoFe 2 O 4 7.0 nm particles using a combination of element selective magnetic spectroscopies with different probing depths. As this picture is not accessible by any other technique, emergent magnetic properties are revealed. The coercive field is not constant in a whole nanospinel. The very thin (0.5 nm) CoFe 2 O 4 hard shell imposes a strong magnetic anisotropy to the otherwise very soft MnFe 2 O 4 core: a large gradient in coercivity is measured inside the MnFe 2 O 4 core with lower values close to the interface region, while the inner core presents a substantial coercive field (0.54 T) and a very high remnant magnetization (90% of the magnetization at saturation).

Saturation (graph theory)

Single domain

10.1002/admi.201700599

Cite

Citations (22)

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

Nanoscale (2020)

Niéli Daffé Jovana Zečević K. N. Trohidou Marcin Sikora Mauro Rovezzi

Hard ferrimagnetic CoFe₂O₄ nanoparticles become softer in the presence of neighbouring soft ferrimagnetic MnFe₂O₄ nanoparticles.

Ferrimagnetism

Ferrofluid

10.1039/d0nr02023k