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 °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 μm, the maximum value of the intrinsic coercivity is 281.6 kA·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 °C to 300 °C, the intrinsic coercivity of the films of above 200 kA·m−1 is obtained.