LAUSR

Abstract C-doped Fe2MnGaCx (x = 0, 0.05, 0.1 and 0.2) alloys have been synthesized and the influence of carbon on the structure and magnetic properties of Fe2MnGa has been investigated. The doping of C can expand the lattice of Fe2MnGa, suggesting that it enters the interstitial site of FCC lattice. The ferromagnetic coupling in Fe2MnGaCx can be strongly enhanced with increasing C content. The ferromagnetic to antiferromagnetic transition in undoped Fe2MnGa is suppressed by C-doping and disappears when x = 0.1 and 0.2. The saturation magnetization Ms and Curie temperature TC also increase with C-doping. Large coercivity and exchange bias can be observed in the magnetic hysteresis loops of Fe2MnGa, due to the coexistence of FM and AFM states. But in Fe2MnGaC0.2, both of them disappear and a pure ferromagnetic character is observed. All this suggests that C-doping can be a possible way to adjust the magnetic properties of Fe2MnGa and other related alloys.