Abstract
Thin films of hexagonal magneto-plumbite-type strontium ferrite with La3+ and Co2+ thin films (LaCo-SrM) substituted for Fe3+ and Sr2+ as magnetic layer with a Pt underlayer were prepared by using a facing targets sputtering system and a flash-annealing process. After the films had been deposited at a low temperature of 250°C, which was not sufficient for crystallization, the specimens were flash-annealed at a high temperature of 900°C for a few minutes. A 22-nm-thick LaCo-SrM film revealed a coercivity of 5.2 kOe, a squareness of 0.85, and a particle size of 20 nm, respectively. To further improve the magnetic properties, LaCo-SrM/Pt multilayered thin films composed of three periods were prepared. The coercivity and squareness of a 78-nm-thick (total thickness of magnetic layers) LaCo-SrM multilayered film were as high as 5.5 kOe and 0.97, respectively. The particle size was also reduced to 18 nm. Stacking the LaCo-SrM in a multilayered structure was found to be effective for improving the magnetic properties necessary for high-density recording media.
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