TY - JOUR
T1 - Magnetic proximity effect features in antiferromagnetic/ferrimagnetic core-shell nanoparticles
AU - Golosovsky, I. V.
AU - Salazar-Alvarez, G.
AU - López-Ortega, A.
AU - González, M. A.
AU - Sort, J.
AU - Estrader, M.
AU - Suriñach, S.
AU - Baró, M. D.
AU - Nogués, J.
PY - 2009/6/16
Y1 - 2009/6/16
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.102.247201
DO - 10.1103/PhysRevLett.102.247201
M3 - Article
SN - 0031-9007
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
M1 - 247201
ER -