Anti-ferromagnetically coupled perpendicular magnetic recording media with oxide
First Claim
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1. An anti-ferromagnetically coupled (“
- AFC”
) perpendicular magnetic recording medium, comprising;
a ferromagnetic stabilization layer with perpendicular anisotropy;
a non-magnetic spacer layer, wherein the non-magnetic spacer layer comprises Ru and an oxide selected from Si, Nb, Cr, W, Zr, or Ti; and
a perpendicularly anisotropic main recording layer, wherein said ferromagnetic stabilization layer and said perpendicularly anisotropic main recording layer are anti-ferromagnetically coupled across said non-magnetic spacer layer, andeach of the stabilization layer and the main recording layer comprise a ferromagnetic Co alloy, wherein the Co alloy comprises;
at least one element selected from Cr, Pt, Ta, B, Mo, Ru, Si, Ge, Nb, Fe, Ni and W, andat least one oxide material selected from Al, Si, Ti, V, Mn, Co, Ni, Zn, Y, Zr, Nb, Mo, Hf and W.
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Abstract
The present invention relates to perpendicular magnetic recording media with improved signal-to-medium noise ratio (“SMNR”) and thermal stability, which media include a pair of vertically spaced-apart perpendicular ferromagnetic layers which are anti-ferromagnetically coupled (“AFC”) across a non-magnetic spacer layer. The invention is of particular utility in the fabrication of data/information storage and retrieval media, e.g., hard disks, having ultra-high areal recording/storage densities.
33 Citations
16 Claims
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1. An anti-ferromagnetically coupled (“
- AFC”
) perpendicular magnetic recording medium, comprising;a ferromagnetic stabilization layer with perpendicular anisotropy; a non-magnetic spacer layer, wherein the non-magnetic spacer layer comprises Ru and an oxide selected from Si, Nb, Cr, W, Zr, or Ti; and a perpendicularly anisotropic main recording layer, wherein said ferromagnetic stabilization layer and said perpendicularly anisotropic main recording layer are anti-ferromagnetically coupled across said non-magnetic spacer layer, and each of the stabilization layer and the main recording layer comprise a ferromagnetic Co alloy, wherein the Co alloy comprises; at least one element selected from Cr, Pt, Ta, B, Mo, Ru, Si, Ge, Nb, Fe, Ni and W, and at least one oxide material selected from Al, Si, Ti, V, Mn, Co, Ni, Zn, Y, Zr, Nb, Mo, Hf and W. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- AFC”
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12. A perpendicular magnetic recording medium, comprising:
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a ferromagnetic stabilization layer with perpendicular anisotropy; and a main recording layer with perpendicular anisotropy; wherein each of the stabilization layer and the main recording layer comprise a Co alloy comprising at least one element selected from Cr, Pt, Ta, B, Mo, Ru, Si, Ge, Nb, Fe, Ni and W, and at least one oxide material selected from Al, Si, Ti, V, Mn, Co, Ni, Zn, Y, Zr, Nb, Mo, Hf and W; and a non-magnetic spacer layer between the stabilization layer and the main recording layer, wherein the non-magnetic spacer layer comprises Ru and an oxide selected from Si, Nb, Cr, W, Zr or Ti; and wherein the stabilization layer and main recording layer are anti-ferromagnetically coupled across the non-magnetic spacer layer. - View Dependent Claims (13, 14, 15)
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16. A perpendicular magnetic recording medium, comprising:
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a stabilization layer with perpendicular anisotropy; and a main recording layer with perpendicular anisotropy; wherein each of the stabilization layer and the main recording layer comprise a Co alloy comprising; at least one element selected from Cr, Pt, Ta, and B, and at least one oxide; and a non-magnetic spacer layer between the stabilization layer and the main recording layer, wherein the non-magnetic spacer layer comprises Ru and an oxide selected from Si, Nb, Cr, W, Zr, or Ti, and wherein the stabilization layer and main recording layer are anti-ferromagnetically coupled across the non-magnetic spacer layer.
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Specification