Effect of cobalt doping on site-disorder and magnetic behavior of magnetoelectric GaFeO3 nanoparticles

摘要

We have prepared a series of GaFeCoO (GFCO, 0 ≤ x ≤ 0.10) nanoparticles and study the effect of Co-doping on their structural and magnetic properties. It is found that with increasing Co-content up to 0.10, the ferrimagnetic transition temperature (T) increases from 325 to 360 K. Magnetic hysteresis loops measured below T exhibit two-phase-like magnetic behavior consisting of hard and soft magnetic phases. These results could be explained in terms of site-disorder in GFCO. Furthermore, magnetic irreversibility is observed in temperature-dependent magnetizations of all the nanoparticles, which are ascribed to the inherent magnetic anisotropy.