Magnetism of GdMn1-xFexO3 (0≤x≤1) Nanoparticles

Magnetic properties of GdMn1-xFexO3 (0 ≤ x ≤ 1) substitutional system are investigated on the nanocrystalline samples prepared by glycine-nitrate method.The polarization of Gd sublattice due to Gd-3d ion exchange interaction was observed for x = 0, 0.2 and 1 below 10.5(5) K, 9.5(5) K, and 5.6(5) K, respectively.The magnetic ordering temperatures of GdMnO3 and GdFeO3 parent compounds were confirmed to be 44(2) K and 658(5) K.The ordering temperatures of 350(10) K, 570(5) K, 605(5) K, and 622(5) K for x = 0.4, 0.5, 0.6, and 0.8, as well as spin-reorientation temperatures of 409(5) K, 430(5) K, and 336(5) K for x = 0.5, 0.6, and 0.8 were systematically higher than the data reported on polycrystalline material and single crystals by other experimental groups.These effects can be explained by the grain size effects and/or amount of vacancies in the crystal structure.