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US 2006/0141292 A1Published application
Perpendicular magnetic recording medium and magnetic recording/reproduction apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsTakeshi Iwasaki, Akira Kikitsu, Soichi Oikawa, Tomoyuki Maeda
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Abstract
At least three underlayers, i.e., a first underlayer containing, as a main component, at least one element selected from Ag, Ir, Ni, Pd, Pt, Rh, Hf, Re, Ru, Ti, Ta, Zr, Mg, and Al, a second underlayer containing Mg or Al and Si, and a third underlayer containing, as a main component, at least one element selected from Pt, Pd, Ru, Rh, Co, and Ti, are formed between a substrate and magnetic recording layer.
Claims21
A perpendicular magnetic recording medium comprising:
- a nonmagnetic substrate;
- a first underlayer formed on the nonmagnetic substrate, and containing, as a main component, at least one element selected from the group consisting of Ag, Ir, Ni, Pd, Pt, Rh, Hf, Re, Ru, Ti, Ta, Zr, Mg, and Al;
- a second underlayer formed on and in contact with the first underlayer, and containing crystal grains which contain one of Mg and Al as a main component, and a grain boundary region which contains Si as a main component and surrounds the crystal grains;
- a third underlayer formed on the second underlayer, and containing, as a main component, at least one element selected from the group consisting of Pt, Pd, Ru, Rh, Co, and Ti;
- and
- a perpendicular magnetic recording layer formed on the third underlayer.
3 more elements
A magnetic recording/reproduction apparatus comprising:
- a perpendicular magnetic recording medium having a nonmagnetic substrate,
- a first underlayer formed on the nonmagnetic substrate, and containing, as a main component, at least one element selected from the group consisting of Ag, Ir, Ni, Pd, Pt, Rh, Hf, Re, Ru, Ti, Ta, Zr, Mg, and Al,
- a second underlayer formed on and in contact with the first underlayer, and containing crystal grains which contain one of Mg and Al as a main component, and a grain boundary region which contains Si as a main component and surrounds the crystal grains,
- a third underlayer formed on the second underlayer, and containing, as a main component, at least one element selected from the group consisting of Pt, Pd, Ru, Rh, Co, and Ti, and
- a perpendicular magnetic recording layer formed on the third underlayer;
- and
- a recording/reproduction head.
4 more elements
Dependencies are inferred from the claim text.