Abstract
α-Fe2O3/g-C3N4 composites were synthesized by loading different amounts of g-C3N4 on ordered α-Fe2O3 nanowires. The samples were characterized by XRD, SEM, TEM, EDS and N2 adsorption-desorption isotherms to study the composition, microstructure and morphology. It showed that g-C3N4 was uniformly dispersed around the α-Fe2O3 nanowires to form α-Fe2O3/g-C3N4 composites. The magnetic properties of samples were obtained by the ZFC-FC and hysteresis loops measurement. The enhancement of exchange bias field in α-Fe2O3/g-C3N4 composites was discovered. FCN-5 exhibited a higher HEB of 794 Oe at 10 K, which exceeded that of pure α-Fe2O3 of 720 Oe. The influence factors of exchange bias in α-Fe2O3/g-C3N4 composites were analyzed by FORC method. The results showed that the enhancement of HEB in α-Fe2O3/g-C3N4 composites was due to the RKKY interaction replacing the original coupling between the initial surface spin-disordered shell layer and the core in α-Fe2O3.
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