Magnetic storage medium and information storage device
View Patent ↗A magnetic storage medium includes a seed layer made of non-magnetic and amorphous Co—Cr—W, an intermediate layer having a crystalline structure, which is made of a non-magnetic material on the seed layer and has a c-axis oriented in a thickness direction of the seed layer in a hexagonal close-packed structure, and a recording layer made of mainly a magnetic material on the intermediate layer and having information magnetically recorded therein.
1. A magnetic storage medium comprising:
a seed layer made of non-magnetic and amorphous Co—Cr—W;
an intermediate layer having a crystalline structure, which is made of a non-magnetic material on the seed layer and has a c-axis oriented in a thickness direction of the seed layer in a hexagonal close-packed structure; and
a recording layer made of mainly a magnetic material on the intermediate layer and having information magnetically recorded therein.
2. The magnetic storage medium according to claim 1 , wherein the recording layer is recorded by magnetization in which a magnetization easy axis is oriented in a thickness direction of the recording layer.
3. The magnetic storage medium according to claim 1 , wherein the recording layer has a granular structure, in which a plurality of magnetic particles made of magnetic materials are separated via a non-magnetic material.
4. The magnetic storage medium according to claim 3 , wherein the recording layer is formed by laminating a plurality of layers having the granular structure.
5. The magnetic storage medium according to claim 1 , wherein the intermediate layer is made of an alloy including Ru or Ru.
6. The magnetic storage medium according to claim 1 , wherein the intermediate layer is made of a plurality of crystal grains, and an interstice is formed between the crystal grains on a surface having the recording layer formed thereon.
7. The magnetic storage medium according to claim 1 , wherein the intermediate layer is formed by laminating a plurality of layers.
8. The magnetic storage medium according to claim 1 , further comprising a soft magnetic under layer formed of an amorphous soft magnetic material including Co and Fe, and
wherein the seed layer is formed on the soft magnetic under layer.
9. The magnetic storage medium according to claim 8 , wherein in the soft magnetic under layer, two soft magnetic layers, each being formed of the soft magnetic material, are laminated via a non-magnetic layer which is formed of a non-magnetic material and serves to anti-ferromagnetically couple magnetization in each of the two soft magnetic layers.
10. An information storage device comprising:
a magnetic storage medium comprising:
a seed layer made of non-magnetic and amorphous Co—Cr—W;
an intermediate layer having a crystalline structure, which is made of a non-magnetic material on the seed layer and has a c-axis oriented in a thickness direction of the seed layer in a hexagonal close-packed structure; and
a recording layer made of mainly a magnetic material on the intermediate layer and having information magnetically recorded therein; and
a head which records and/or reproduces information with respect to the magnetic storage medium.