Heat-assisted magnetic recording medium and magnetic storage device
View Patent ↗A heat-assisted magnetic recording medium includes a substrate, a plurality of foundation layers, and a magnetic layer. The plurality of foundation layers are provided on the substrate and include a first layer containing MnO. The magnetic layer is provided on the plurality of layers and includes an alloy as a main ingredient. The alloy has an L1 0 structure.
1. A heat-assisted magnetic recording medium comprising:
a substrate;
a plurality of foundation layers provided on the substrate and including a first foundation layer containing MnO; and
a magnetic layer provided on the plurality of foundation layers and including an alloy as a main ingredient, the alloy having an L1 0 structure.
2. The heat-assisted magnetic recording medium according to claim 1 , wherein the first foundation layer is provided on a second foundation layer consisting of Cr or consisting of an alloy which contains Cr as a main ingredient and at least one of Ti, V, Mo, W, Mn and Ru, the second foundation layer having a body-centered cubic lattice structure.
3. The heat-assisted magnetic recording medium according to claim 1 , wherein the first foundation layer is provided on a second foundation layer consisting of an alloy which contains Cr as a main ingredient, at least one of Ti, V, Mo, W, Mn and Ru, and further at least one of B and C, the foundation layer having a body-centered cubic lattice structure.
4. The heat-assisted magnetic recording medium according to claim 1 , wherein the first foundation layer is provided on a second foundation layer consisting of Mo, W, Ta, Nb or an alloy which contains at least one of Mo, W, Ta and Nb, the foundation layer having a body-centered cubic lattice structure which has a lattice constant of 0.3 nm or greater.
5. The heat-assisted magnetic recording medium according to claim 1 , wherein the first foundation layer is provided on a second foundation layer having a B2 structure and consisting of NiAl or RuAl.
6. The heat-assisted magnetic recording medium according to claim 1 , wherein the plurality of foundation layers include a third foundation layer consisting of MgO, and the first foundation layer is provided on the third foundation layer.
7. The heat-assisted magnetic recording medium according to claim 6 , wherein the third foundation layer is provided on a second foundation layer consisting of Cr or consisting of an alloy which contains Cr as a main ingredient and at least one of Ti, V, Mo, W, Mn and Ru, the second foundation layer having a body-centered cubic lattice structure.
8. The heat-assisted magnetic recording medium according to claim 6 , wherein the third foundation layer is provided on a second foundation layer consisting of an alloy which contains Cr as a main ingredient, at least one of Ti, V, Mo, W, Mn and Ru, and further at least one of B and C, the second foundation layer having a body-centered cubic lattice structure.
9. The heat-assisted magnetic recording medium according to claim 6 , wherein the third foundation layer is provided on a second foundation layer consisting of Mo, W, Ta, Nb or an alloy which contains at least one of Mo, W, Ta and Nb, the second foundation layer having a body-centered cubic lattice structure which has a lattice constant of 0.3 nm or greater.
10. The heat-assisted magnetic recording medium according to claim 6 , wherein the third foundation layer is provided on a second foundation layer having a B2 structure and consisting of NiAl or RuAl.
11. The heat-assisted magnetic recording medium according to claim 1 , wherein the magnetic layer has an L1 0 structure, and contains an FePt or CoPt alloy as a main ingredient and further contains SiO 2 , TiO 2 , Cr 2 O 3 , Al 2 O 3 , Ta 2 O 5 , ZrO 2 , Y 2 O 3 , CeO 2 , MnO, TiO, ZnO, C or a combination thereof.
12. magnetic storage device comprising:
the heat-assisted magnetic recording medium according to claim 1 ;
a magnetic recording medium driving device to rotate the heat-assisted magnetic recording medium;
a magnetic head comprising:
a laser generator to generate a laser beam;
a near-field light generator mounted at an end of the magnetic head and to generate near-field light which heats the heat-assisted magnetic recording medium upon reception of the laser beam; and
a waveguide to guide the laser beam to the near-field light generator;
a magnetic head driving device to move the magnetic head; and
a record regeneration signal processing device.