Phys. Rev. Lett. 102, 247201 (2009) [4 pages]Magnetic Proximity Effect Features in Antiferromagnetic/Ferrimagnetic Core-Shell NanoparticlesReceived 8 December 2008; published 16 June 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.247201
DOI:
10.1103/PhysRevLett.102.247201
PACS:
75.50.Tt, 61.05.F−, 75.30.Kz, 75.75.+a
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