Nanoscale Distribution of Magnetic Anisotropies in Bimagnetic Soft Core-Hard Shell MnFe 2 O 4 @CoFe 2 O 4 Nanoparticles

Niéli Daffé (1, 2, 3) , Marcin Sikora (4) , Mauro Rovezzi (5) , Nadejda Bouldi (1) , Véronica Gavrilov (2) , Sophie Neveu (2) , Fadi Choueikani (6) , Philippe Ohresser (3) , Vincent Dupuis (2) , Dario Taverna (1) , Alexandre Gloter (7) , Marie-Anne Arrio (1) , Philippe Sainctavit (1, 3) , Amelie Juhin (1)

1 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie
2 SU - Sorbonne Université
3 SSOLEIL - Synchrotron SOLEIL
4 AGH UST - AGH University of Science and Technology [Krakow, PL]
5 ESRF - European Synchrotron Radiation Facility
6 DIOM - Dispositifs et Instrumentation en Optoélectronique et micro-ondes
7 LPS - Laboratoire de Physique des Solides

The nanoscale distribution of magnetic anisotropies is measured in core@shell MnFe2O4@CoFe2O4 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) CoFe2O4 hard shell imposes a strong magnetic anisotropy to the otherwise very soft MnFe2O4 core: a large gradient in coercivity is measured inside the MnFe2O4 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).

Mots clés: core–shell nanoparticles; magnetic anisotropy; RIXS; RIXS‐MCD; spinel ferrites; XAS; XMCD

Domaines: Chimie; Matériaux

Niéli Daffé, Marcin Sikora, Mauro Rovezzi, Nadejda Bouldi, Véronica Gavrilov, et al.. Nanoscale Distribution of Magnetic Anisotropies in Bimagnetic Soft Core-Hard Shell MnFe 2 O 4 @CoFe 2 O 4 Nanoparticles. Advanced Materials Interfaces, 2017, 4 (22), pp.1700599. ⟨10.1002/admi.201700599⟩. ⟨hal-01921157⟩