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Title: Size-Dependent passivation shell and magnetic properties in antiferromagnetic/ferrimagnetic core/shell MnO nanoparticles
Author: López-Ortega, Alberto
Tobia, Dina
Winkler, Elin
Golosovsky, Igor V.
Salazar-Alvarez, German
Estradé Albiol, Sònia
Estrader i Bofarull, Marta
Sort, Jordi
González, Miguel
Suriñach, Santiago (Suriñach Cornet)
Arbiol i Cobos, Jordi
Peiró Martínez, Francisca
Zysler, Roberto D.
Baró, M. D.
Nogués, Josep
Keywords: Nanopartícules
Propietats magnètiques
Magnetic properties
Issue Date: 22-Jun-2010
Publisher: American Chemical Society
Abstract: The magnetic properties of bimagnetic core/shell nanoparticles consisting of an antiferromagnetic MnO core and a ferrimagnetic passivation shell have been investigated. It is found that the phase of the passivation shell (γ-Mn2O3 or Mn3O4) depends on the size of the nanoparticles. Structural and magnetic characterizations concur that while the smallest nanoparticles have a predominantly γ-Mn2O3 shell, larger ones have increasing amounts of Mn3O4. A considerable enhancement of the Néel temperature, TN, and the magnetic anisotropy of the MnO core for decreasing core sizes has been observed. The size reduction also leads to other phenomena such as persistent magnetic moment in MnO up to high temperatures and an unusual temperature behavior of the magnetic domains.
Note: Versió postprint del document publicat a:
It is part of: Journal of the American Chemical Society, 2010, vol. 132, num. 27, p. 9398-9407
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ISSN: 0002-7863
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Articles publicats en revistes (Química Inorgànica i Orgànica)
Publicacions de projectes de recerca finançats per la UE

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