Elucidating Individual Magnetic Contributions in Bi-Magnetic Fe3O4/Mn3O4 Core/Shell Nanoparticles by Polarized Powder Neutron Diffraction
Golosovsky, Igor V. (Kurchatov Institute)
Kibalin, I.A. (Laboratoire Léon Brillouin)
Gukasov, Arsen (Laboratoire Léon Brillouin)
Gómez Roca, Alejandro (Institut Català de Nanociència i Nanotecnologia)
López-Ortega, Alberto (Universidad Pública de Navarra)
Estrader i Bofarull, Marta (Universitat de Barcelona. Departament de Química Inorgànica)
Vasilakaki, Marianna (Institute of Nanoscience and Nanotechnology)
Trohidou, Kalliopi N. (Institute of Nanoscience and Nanotechnology)
Hansen, T.C. (Institut Laue Langevin)
Puente Orench, Inés (Instituto de NanoCiencia y Materiales de Aragón)
Lelièvre-Berna, E. (Institut Laue Langevin)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)

Date:	2023
Abstract:	Heterogeneous bi-magnetic nanostructured systems have had a sustained interest during the last decades owing to their unique magnetic properties and the wide range of derived potential applications. However, elucidating the details of their magnetic properties can be rather complex. Here, a comprehensive study of FeO/MnO core/shell nanoparticles using polarized neutron powder diffraction, which allows disentangling the magnetic contributions of each of the components, is presented. The results show that while at low fields the FeO and MnO magnetic moments averaged over the unit cell are antiferromagnetically coupled, at high fields, they orient parallel to each other. This magnetic reorientation of the MnO shell moments is associated with a gradual evolution with the applied field of the local magnetic susceptibility from anisotropic to isotropic. Additionally, the magnetic coherence length of the FeO cores shows some unusual field dependence due to the competition between the antiferromagnetic interface interaction and the Zeeman energies. The results demonstrate the great potential of the quantitative analysis of polarized neutron powder diffraction for the study of complex multiphase magnetic materials.
Grants:	European Commission 871072 Agencia Estatal de Investigación PID2019-106165GB-C22 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00651 Agencia Estatal de Investigación RYC2019-027449-I Ministerio de Ciencia e Innovación CEX2021-001214-S Agencia Estatal de Investigación RYC2018-024396-I Agencia Estatal de Investigación PID2019-106229RB-I0 Agencia Estatal de Investigación PID2021-122613OB-I00
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Small Methods, Vol. 7, Issue 10 (October 2023) , art. 2201725, ISSN 2366-9608

DOI: 10.1002/smtd.202201725

10 p, 2.6 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles