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Electroplated CoNiMnP-based permanent magnetic films with thickness of 4μm, 25μm and 43.5μm were fabricated and tested. Composed of 76.38 wt% Co, 16.66 wt% Ni, 3.64 wt% P and 2.32 wt% Mn, the films exhibited good surface morphology. In the case of 4μm thick film, we successfully achieved a high lateral coercivity of 711Oe, a retentivity up to 8933Gs and an energy density of 16.9kJ/m3. The film thickness dependence of magnetic property was also investigated, showing a decrease of the retentivity and coercivity with the increase in thickness. In addition, it was observed that Zn as an additive could improve the surface morphology by eliminating micro cracks.
Date of Conference: 20-23 Feb. 2011