التفاصيل البيبلوغرافية
| العنوان: |
Laminate structure, magnetic recording medium and method for producing the same, magnetic recording device, magnetic recording method, and element with the laminate structure |
| Document Number: |
20060204794 |
| تاريخ النشر: |
September 14, 2006 |
| Appl. No: |
11/222510 |
| Application Filed: |
September 08, 2005 |
| مستخلص: |
The objects of the present invention is to provide laminate structures that are adapted widely in a wide range of fields such as magnetic recording media, nonvolatile memories, giant magneto resistance elements, spin valve films, tunnel effect films, various sensors, displays, and optical elements; high-quality magnetic recording media that can perform high-density recording and high-velocity recording with higher capacity without increasing write current at magnetic heads, in particular exhibit excellent overwrite properties, uniform properties, in particular superior saturation magnetization (tBr) and the anisotropy field (Hd), and the like. The laminate structure of the present invention contains a number of metal nanopillars and plural insulating layers, wherein the lengths of the metal nanopillars are approximately equivalent, each of the plural insulating layers is penetrated by the metal nanopillars, and the plural insulating layers are laminated to each other. The magnetic recording medium of the present invention contains the laminate structure on the substrate, and the metal nanopillars formed of a magnetic material extend to a direction approximately perpendicular to the surface of the substrate. |
| Inventors: |
Kikuchi, Hideyuki (Kawasaki, JP); Itoh, Ken-ichi (Kawasaki, JP); Masuda, Hideki (Tokyo, JP) |
| Claim: |
1. A laminate structure comprising: a number of metal nanopillars, and plural insulating layers, wherein the lengths of the metal nanopillars are approximately equivalent, each of the plural insulating layers is penetrated by the metal nanopillars, and the plural insulating layers are laminated to each other. |
| Claim: |
2. The laminate structure according to claim 1, wherein the insulating layers are formed of alumina. |
| Claim: |
3. The laminate structure according to claim 1, wherein a material of the insulating layers exhibits an etching rate different from the etching rate of the material of the metal nanopillars under an identical etching condition. |
| Claim: |
4. The laminate structure according to claim 1, wherein the material of the metal nanopillars is a magnetic material. |
| Claim: |
5. The laminate structure according to claim 1, wherein the diameter of the metal nanopillars is 100 nm or less. |
| Claim: |
6. The laminate structure according to claim 1, wherein the length of the metal nanopillars is 200 nm to 10,000 nm. |
| Claim: |
7. The laminate structure according to claim 1, wherein the space between the adjacent metal nanopillars is 5 nm to 500 nm. |
| Claim: |
8. The laminate structure according to claim 1, wherein the sites of the metal nanopillars at an insulating layer are approximately the same as the sites of the metal nanopillars at the adjacent insulating layer, and the metal nanopillars of the insulating layer and the metal nanopillars of the adjacent insulating layer contact each other. |
| Claim: |
9. The laminate structure according to claim 1, wherein at least one of the material of the metal nanopillars and the material of the insulating layer is the same between adjacent insulating layers. |
| Claim: |
10. The laminate structure according to claim 1, wherein at least one of the diameter and the length of the metal nanopillars is the same or different in terms of the adjacent insulating layers. |
| Claim: |
11. The laminate structure according to claim 1, wherein an intermediate layer is disposed between adjacent insulating layers. |
| Claim: |
12. The laminate structure according to claim 1, wherein the intermediate layer is formed of an insoluble or hardly soluble material under an anodization process. |
| Claim: |
13. The laminate structure according to claim 1, wherein the metal nanopillars are arranged into one of concentric patterns and spiral patterns. |
| Claim: |
14. The laminate structure according to claim 1, wherein the metal nanopillars are formed by filling the material of the metal nanopillars into nanoholes formed by anodization of the insulating layer. |
| Claim: |
15. A magnetic recording medium, comprising: a substrate, and a laminate structure on the substrate, wherein the laminate structure comprises a number of metal nanopillars and plural insulating layers, the metal nanopillars are formed of a magnetic material, and extend to a direction approximately perpendicular to the surface of the substrate, and the lengths of the metal nanopillars are approximately equivalent, and each of the plural insulating layers is penetrated by the metal nanopillars, and the plural insulating layers are laminated to each other. |
| Claim: |
16. The magnetic recording medium according to claim 15, wherein the plural insulating layers comprise an insulating layer proximal to the substrate and an insulating layer distal to the substrate, and the insulating layer proximal to the substrate and the insulating layer distal to the substrate are adjacent to each other, the metal nanopillars within the insulating layer proximal to the substrate is formed of a soft-magnetic material, the metal nanopillars within the insulating layer distal to the substrate is formed of a ferromagnetic material, and the thickness of the insulating layer distal to the substrate is not more than the thickness of the insulating layer proximal to the substrate. |
| Claim: |
17. The magnetic recording medium according to claim 16, wherein a soft-magnetic underlayer is disposed between the substrate and the insulating layer proximal to the substrate. |
| Claim: |
18. The magnetic recording medium according to claim 17, wherein the thickness of the insulating layer distal to the substrate is no more than the total thickness of the insulating layer proximal to the substrate and the soft-magnetic underlayer. |
| Claim: |
19. The magnetic recording medium according to claim 16, wherein a nonmagnetic layer is disposed between the insulating layer distal to the substrate and the insulating layer proximal to the substrate. |
| Claim: |
20. An element comprising a laminate structure, wherein the laminate structure comprises a number of metal nanopillars and plural insulating layers, the lengths of the metal nanopillars are approximately equivalent, each of the plural insulating layers is penetrated by the metal nanopillars, and the plural insulating layers are laminated to each other. |
| Current U.S. Class: |
428836/200 |
| Current International Class: |
11; 32 |
| رقم الانضمام: |
edspap.20060204794 |
| قاعدة البيانات: |
USPTO Patent Applications |