Intrinsic Coercivity of SmCo Based Permanent Magnetic Films Prepared on Hot Substrates at 650 °C

The intrinsic coercivity of the SmCo based permanent magnetic films prepared on the hot Si substrate at 650 degrees C with Al, Cu, Ag, Mo, and Cr underlayer without a subsequent annealing process was investigated. The results show that the films with Mo and Cr underlayer provide an improved intrinsic coercivity. The film thickness presents a complex effect on the intrinsic coercivity of the films with Mo underlayer. When the film thickness is 3.0 mu m, the maximum value of the intrinsic coercivity is 281.6 kA3.m(-1) at room temperature. Furthermore, the temperature dependence of intrinsic coercivity is found to be strongly correlated with the magnetic parameters. In the range from 25 degrees C to 300 degrees C, the intrinsic coercivity of the films of above 200 kA.m(-1) is obtained.