Magnetic proximity effect features in antiferromagnetic/ferrimagnetic core-shell nanoparticles
Golosovsky, I. V. (Peterburgskiĭ institut i︠a︡dernoĭ fiziki im. B.P. Konstantinova)
Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física)
Salazar Álvarez, Germán (Centre d'Investigació en Nanociència i Nanotecnologia)
López-Ortega, Alberto (Centre d'Investigació en Nanociència i Nanotecnologia)
Gonzalez, M. A. (Institut Laue Langevin)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Estrader, Marta (Centre d'Investigació en Nanociència i Nanotecnologia)
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física)
Nogués, Josep (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Date:	2009
Abstract:	A study of "inverted" core-shell, MnO/γ-Mn2O3, nanoparticles is presented. Crystal and magnetic structures and characteristic sizes have been determined by neutron diffraction for the antiferromagnetic core (MnO) and the ferrimagnetic shell (γ-Mn2O3). Remarkably, while the MnO core is found to have a TN not far from its bulk value, the magnetic order of the γ-Mn2O3 shell is stable far above TC, exhibiting two characteristic temperatures, at T~ 40  K [TC(γ-Mn2O3)] and at T~120  K [~ TN(MnO)]. Magnetization measurements are consistent with these results. The stabilization of the shell moment up to TN of the core can be tentatively attributed to core-shell exchange interactions, hinting at a possible magnetic proximity effect.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; Versió publicada
Published in:	Physical review letters, Vol. 102, Issue 24 (June 2009) , p. 247201, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.102.247201

4 p, 261.2 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Published articles