Magnetic proximity effect features in antiferromagnetic/ferrimagnetic core-shell nanoparticles

I. V. Golosovsky, G. Salazar-Alvarez, A. López-Ortega, M. A. González, J. Sort, M. Estrader, S. Suriñach, M. D. Baró, J. Nogués

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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∼40K [TC(γ-Mn2O3)] and at T∼120K [∼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. © 2009 The American Physical Society.
Original languageEnglish
Article number247201
JournalPhysical Review Letters
Publication statusPublished - 16 Jun 2009


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