Initial susceptibility and viscosity properties of low concentration ε-Fe3N based magnetic fluid

In this paper, the initial susceptibility of e-Fe3N magnetic fluid at volume concentrations in the range F = 0.0 ~ 0.0446 are measured. Compared with the experimental initial susceptibility, the Langevin, Weiss and Onsager susceptibility were calculated using the data obtained from the low concentration e-Fe3N magnetic fluid samples. The viscosity of the e-Fe3N magnetic fluid at the same concentrations is measured. The result shows that, the initial susceptibility of the low concentration e-Fe3N magnetic fluid is proportional to the concentration. A linear relationship between relative viscosity and the volume fraction is observed when the concentration F < 0.02.