Magnetic disk using a glass substrate
View Patent ↗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.
1. 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.
2. A magnetic disk according to claim 1 , further comprising:
a seed layer which has a B2 crystal structure and which is formed between the amorphous underlayer and the magnetic layer.
3. A magnetic disk according to claim 1 , wherein:
the magnetic layer includes an exchange coupling film.
4. A magnetic disk according to claim 1 , wherein:
the magnetic disk is loaded in a hard drive of a load/unload system.