Abstract
Cobalt, nickel, and cobalt‐nickel alloy were electrodeposited into the micropores of anodic oxide films on aluminum obtained in a sulfuric acid bath. The deposits in the micropores were separated from the oxide films and were observed as needlelike crystals about 100Å in diameter. The metallic deposits were quite dense at the bottom of the micropores and then gradually grew to the surface. Finally the deposits form layers distributed uniformly parallel to the surface. The density of residual magnetizations in cobalt and nickel deposits increase to about 1700 and 600G, respectively, when the outer layers are lapped down to a few microns in thickness. The films can be used as magnetic recording disks.
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