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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/176672
Size-Dependent passivation shell and magnetic properties in antiferromagnetic/ferrimagnetic core/shell MnO nanoparticles
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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.
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LÓPEZ-ORTEGA, Alberto, et al. Size-Dependent passivation shell and magnetic properties in antiferromagnetic/ferrimagnetic core/shell MnO nanoparticles. Journal of the American Chemical Society. 2010. Vol. 132, num. 27, pags. 9398-9407. ISSN 0002-7863. [consulted: 18 of June of 2026]. Available at: https://hdl.handle.net/2445/176672