LaCo置換型Srフェライト薄膜の多層化による特性改善

概要

論文の詳細を見る
Thin films of hexagonal magneto-plumbite-type strontium ferrite with La^<3+> and Co^<2+> thin films (LaCo-SrM) substituted for Fe^<3+> and Sr^<2+> 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℃, which was not sufficient for crystallization, the specimens were flash-annealed at a high temperature of 900℃ 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 20nm, 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 18nm. Stacking the LaCo-SrM in a multilayered structure was found to be effective for improving the magnetic properties necessary for high-density recording media.
社団法人日本磁気学会の論文
2005-06-01