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US 6,916,558 B2Granted
Magnetic disk using a glass substrate
AssigneesHoya Corporation, Hoya Magnetics Singapore Pte. Ltd.
InventorsTeiichiro Umezawa, Hiroshi Tomiyasu, Keiji Moroishi
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Abstract
In a magnetic disk having a glass substrate, an amorphous underlayer is formed on the glass substrate. A magnetic layer is formed on the amorphous underlayer. The glass substrate is provided with a texture formed to induce magnetic anisotropy in the magnetic layer. The amorphous underlayer contains a group IVa element on a glass substrate side and a group Va element on a magnetic layer side.
Claims4
A magnetic disk having a glass substrate, comprising:
- an amorphous underlayer formed on the glass substrate;
- and
- a magnetic layer formed on the amorphous underlayer;
- the glass substrate being provided with a texture formed to induce magnetic anisotropy in the magnetic layer;
- wherein the amorphous underlayer is formed immediately above the glass substrate provided with the texture, and
- the amorphous underlayer comprises a first amorphous layer made of a first material comprising at least one of Ti or Zr added to Cr and a second amorphous layer made of a second material comprising at least one of Nb and Ta added to Cr, the second amorphous layer being formed directly on the first amorphous layer.
3 more elements
Dependencies are inferred from the claim text.