Magnetic properties of Co and Co-Fe electrodeposited alumite films

Co and Co-Fe were electrodeposited in pores of anodic oxidized alumite films. It is shown that the magnetic anisotropy energy and the perpendicular coercive force of Co electrodeposited alumite films can be controlled widely by changing the pH and the temperature of the Co solutions without changing the particle diameter. It is shown that, by properly selecting the composition of the electrodeposited alloys, the saturation magnetization and the coercive force of the magnetic alumite films can be controlled. At a composition of 50 at.% Co-Fe, the perpendicular coercive H/sub c/( perpendicular to ) reaches a maximum value of 2700 Oe and the saturation magnetization is as high as 382 emu/cm/sup 3/ for the packing density P=0.2. Therefore, with this composition, the magnetic alumite film can be used for recording media.<
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