Magnetic Properties of Co-Doped Bismuth Ferrite Nanoparticles Prepared by the Solution Method

Abstract

In this work, BiFeO3 and BiCo[Formula: see text]Fe[Formula: see text]O3 nanoparticles prepared by the solution method were further investigated the magnetic properties. At room temperature, BiFeO3 reveals the antiferromagnetic order. However, Co doping achieves ferromagnetic enhancement. The room-temperature ferromagnetism and the causes are ulteriorly studied with the help of ABK plots. The stronger coercivity is due to the oxygen vacancies and stronger magnetic anisotropy caused by Co substitution. Under variable temperatures, the bifurcate curves of zero-field-cooled and field-cooled indicate the existence of spin-glass state for both samples. The weak ferromagnetism at low temperature and the spin-state transition of cobalt ions at 270[Formula: see text]K are also found.