title: Magnetic proximity effect features in antiferromagnetic/ferrimagnetic core-shell nanoparticles.
abstract: A study of "inverted" core-shell, MnO/gamma-Mn(2)O(3), 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 (gamma-Mn(2)O(3)). Remarkably, while the MnO core is found to have a T_{N} not far from its bulk value, the magnetic order of the gamma-Mn(2)O(3) shell is stable far above T_{C}, exhibiting two characteristic temperatures, at T approximately 40 K [T_{C}(gamma-Mn(2)O(3))] and at T approximately 120 K [ approximately T_{N}(MnO)]. Magnetization measurements are consistent with these results. The stabilization of the shell moment up to T_{N} of the core can be tentatively attributed to core-shell exchange interactions, hinting at a possible magnetic proximity effect.
authors: St. Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg, Russia.
authors: I V
authors: IV
authors: Golosovsky
authors: G
authors: G
authors: Salazar-Alvarez
authors: A
authors: A
authors: López-Ortega
authors: M A
authors: MA
authors: González
authors: J
authors: J
authors: Sort
authors: M
authors: M
authors: Estrader
authors: S
authors: S
authors: Suriñach
authors: M D
authors: MD
authors: Baró
authors: J
authors: J
authors: Nogués