Abstract
Using a constant power source and both binary and single target magnetron sputtering, samples with periodic structures were produced while varying the substrate rotation speed. Characteristics reached a maximum at 5 rpm and in-plane magnetization films resulted at 1 rpm. Annealing samples with a protective layer causes all characteristics except the Kerr rotation angle (θK) to vary. These variations were peculiar to periodic structures. The change in the coercive force (Hc) indicated a structural transition. The large Hc and saturation magnetization (Ms) values promise superior recording resolution. The carrier-to-noise ratio was improved by one to two dB and showed no changes after 1000 h in the open air at 55°C.
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