| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic recording medium that has a fine magnetic domain and a thermal stability ratio in a permissible range, and has a magnetic data recording layer having a high areal density, and to provide a sputter target for the magnetic recording medium. SOLUTION: A magnetic data storage layer 106 includes a high-Ku alloy and an oxide compound of oxygen and either a single element or an alloy. Because of their high Ku, the magnetic domains of this magnetic data storage layer can be made significantly smaller, while maintaining an acceptable thermal stability ratio of about 50 to 70, to provide areal densities of greater than 200 Gb/in<SP>2</SP>(about 31 Gb/cm<SP>2</SP>). Sputter targets for sputtering such a magnetic data storage layer are also provided. The sputter targets include the high-Ku alloy and either the desired oxide compounds, or the elements to be oxidized in a reactive sputtering process. The high-Ku alloy has an anisotropy constant of at least 0.5×10<SP>7</SP>ergs/cm<SP>3</SP>(0.5 J/cm<SP>3</SP>). COPYRIGHT: (C)2008,JPO&INPIT
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