In the experiments, Ni-Co-P magnetic films were deposited on aluminium alloyed workpieces by chemical plating. The coercive force He, the saturation magnetic moment Ms and the residual magnetism Mr of the magnetic films were measured by a vibrating sample magnetometer. The changes in He with relative content of Ni and Co were studied. The He values of the films were measured with the pH values varying at 9.1, 9.3, 9.7. And the effects of magnetic fields parallel or vertical to the plate on He were observed.
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