| 摘要 |
A magnetic recording medium having a Ru-based lower layer comprised of Ru and a weakly-magnetic alloying element, and a sputter target that is comprised of one of Ru-based alloys and sputters an lower layer in a magnetic recording medium are provided, wherein the alloy element improves the signal-to-noise ratio(SNR) and the perpendicular magnetic anisotropy Ku of the magnetic recording medium by refining grain size and reducing lattice misfit. A magnetic recording medium comprises a first layer comprised of ruthenium(Ru) and an alloying element, wherein the alloying element is selected from the group consisting of B, Al, Si, Mn, Ge, Se, Zr, Ag, Sn, Yb, Lu, Hf, Os, Au, Bi and Th, and the alloying element is present in the first layer in an amount exceeding a solid solubility limit of the alloying element in hexagonal close-packed(HCP) phase Ru at room temperature or above. A magnetic recording media stack(100) comprises a substrate(101)(e.g., glass or Al), a seed layer(104), a lower layer(105) and a magnetic recording layer(106). The media stack additionally comprises one or more soft lower layers with or without other non-magnetic or magnetic layers, such as layers(102,103), disposed on the substrate. The media stack further comprises a lubrication layer and a carbon overcoat with or without other magnetic or non-magnetic layers such as layers(107,108).
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