CoPtCr-SiO_2を用いた垂直磁気記録媒体の磁気特性と記録再生特性(磁気記録媒体)

概要

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A SiO_2-added CoPtCr magnetic layer was employed in perpendicular recording media. The microstructure, magnetic properties, and recording performance of these media are discussed. The addition of SiO_2 to CoPtCr is very effective for enhancing a well-isolated fine grain structure without disturbing the epitaxial growth of CoPtCr grains on a Ru underlayer. Very fine grains with a size of 〜 7 nm, are realized, surrounded by grain boundaries which consist mainly of silicon oxide. The media show a large perpendicular anisotropy K_u of 〜3.6 × 10^6 erg/cm^3 and a K_uV/kT value of more than 80, even at a CoPtCr-SiO_2 thickness of 12 nm, resulting in a high coercivity H_c of 4.3 kOe and high squareness M_r/M_s of 0.9. The CoPtCr-SiO_2 medium has a very small signal decay of 0.4%/decade at this thickness, and exhibits excellent SNR performance together with high thermal stability at very low thickness, indicating a great potential for use in high-density perpendicular recording media.
社団法人日本磁気学会の論文
2003-04-01