We have prepared a series of GaFe1−xCoxO3 (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 (TC) increases from 325 to 360 K. Magnetic hysteresis loops measured below TC 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.
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Han et al. (2014) studied this question.
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