We studied coupled granular/continuous (CGC) perpendicular media consisting of a continuous multilayer structure and a granular layer. The addition of Co/Pt multilayers decreased the nucleation field from 200 to -1800Oe and increased the squareness from 0.9 to 1.0. The moment decay at room temperature was significantly reduced from -4.8% to -0.05% per decade. At elevated temperatures, strong exchange coupling between a granular layer and a continuous layer is needed for thermal stability. The exchange-coupled continuous layer reduces thermal demagnetization as it effectively increases the grain size, tightens the grain distribution, and prevents the reversal of individual grains. Magnetic Force Microscope image showed a larger magnetic cluster size for the CGC structure. Compared to the CoCr18Pt12 medium, the CGC medium had 2.3dB higher output. However, the noise for the CGC medium increased with the recording density, while the noise for the CoCr18Pt12 medium remained constant from 4 to 15kfc/mm. Further optimization and noise reduction are still required for future high density recording.
|ジャーナル||Journal of Magnetism and Magnetic Materials|
|出版ステータス||Published - 2001 10月|
|イベント||Proceedings of the 5th Perpendicular Magnetic Recording Conference (PMRC 2000) - Sendai, Japan|
継続期間: 2000 10月 23 → 2000 10月 26
ASJC Scopus subject areas