2004 Volume 45 Issue 2 Pages 369-372
This paper describes magnetic properties and microstructures of Sm-Fe-N thick films prepared by the aerosol deposition (AD) method. The maximum thickness (d) of 77 μm was obtained in the AD conditions of gas flow rate (gfr) = 6 × 10−3 m3/min for 4 min. From this result, the deposition rate was estimated as 19 μm/min. The density (ρ) of Sm-Fe-N films were in the range of 4.9 × 103−5.9 × 103 kg/m3, which were 64—77% of the X-ray density of the Sm2Fe17N3 compound reported (7.67 × 103 kg/m3). However, they were higher than the density of the green compact of Sm-Fe-N host powders (3.86 × 103 kg/m3). The Sm-Fe-N AD films showed the remanences (Br) of 0.36—0.42 T, which were 58—68% of that of host powder (0.62 T). The coercivities (μ0HcJ) increased from 1.16 T to 1.69—1.86 T after the deposition because the average grain size decreased from 1.94 to 0.32 μm. XRD analysis revealed that the ratio of peak intensity of (006) to (033) in the Sm-Fe-N AD films was higher than that in the host powder. In addition, the remanence measured in perpendicular to the film plane was higher than that in parallel after the compensation of demagnetizing field. Therefore, it is considered that the c-axis in Sm-Fe-N AD films has a tendency to align in perpendicular to the film plane.
