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Magnetic properties of Sm–Fe(Ti)–C(N)/α-Fe alloys prepared by mechanical alloying

Magnetic properties of Sm–Fe(Ti)–C(N)/α-Fe nanocomposite alloys prepared by mechanical alloying (MA) have been studied. The hysteresis loops of MA Sm12Fe74Ti7C7Nδ, Sm10Fe76Ti7C7Nδ and Sm19.0Fe66.7C14.3 (i.e. Sm20Fe70C15) made by different processes (annealing, nitriding and re-milling) were measured at the applied magnetic fields with different dH/dt at 400, 350 and 295 K. The main phase with hard magnetic properties is of TbCu7-type. These three alloys have different behaviours of magnetization processes when the magnetic fields with dH/dt = 31.6 and 94.7 MA ms−1 are applied. The magnetic viscosity Sv of Sm12Fe74Ti7C7Nδ, Sm10Fe76Ti7C7Nδ and Sm20Fe70C15 is determined from hysteresis loops measured for different dH/dt at various temperatures. The magnetic viscosity Sv in the Sm–Fe(Ti)–C(N)/α-Fe alloys is approximately proportional to the coercive field iHc at the measuring temperature.