System and method for writing to a magnetic shift register
View Patent ↗A writing device can change the direction of the magnetic moment in a magnetic shift register, thus writing information to the domains or bits in the magnetic shift register. Associated with each domain wall are large magnetic fringing fields. The domain wall concentrates the change in magnetism from one direction to another in a very small space. Depending on the nature of the domain wall, very large dipolar fringing fields can emanate from the domain wall. This characteristic of magnetic domains is used to write to the magnetic shift register. When the domain wall is moved close to another magnetic material, the large fields of the domain wall change the direction of the magnetic moment in the magnetic material, effectively “writing” to the magnetic material.
1. A data writing element, comprising:
a wire that comprises magnetic domains that define at least one magnetic domain wall; and
an energy source for passing an electric current through the wire, to selectively shift the magnetic domain wall along the wire;
wherein shifting the magnetic wall generates a localized fringing field that causes data to be written on a medium that is disposed in proximity to the wire.
2. The data writing element of claim 1 , wherein the electric current is moved in one direction to write data in a “1” bit.
3. The data writing element of claim 2 , wherein the electric current is moved in an opposite direction to write data in a “0” bit.
4. The data writing element of claim 1 , wherein the wire comprises a bend that is disposed in proximity to the medium, to enhance the effect of the fringing field from the domain wall.
5. The data writing element of claim 1 , wherein the medium comprises a shift register.
6. The data writing element of claim 5 , wherein the shift register comprises a plurality of magnetic domains for storing the data.
7. The data writing element of claim 6 , wherein the shifting of the magnetic wall causes the data to be written in the magnetic domains.
8. The data writing element of claim 1 , wherein the medium comprises a data storage disk.
9. The data writing element of claim 1 , wherein the wire comprises a plurality of domains.
10. The data writing element of claim 9 , further comprising means for pinning at least some of the domains.
11. The data writing element of claim 1 , wherein the wire is made, at least in part, of magnetic material having a direction of magnetization; and
wherein the electric current comprises electrons having a spin polarization in the same direction as the direction of magnetization.
12. The data writing element of claim 1 , wherein the wire is made, at least in part, of magnetic material having a direction of magnetization; and
wherein the electric current comprises electrons having a spin polarization in a direction that is opposite to the direction of magnetization.
13. A data writing element, comprising:
means, comprising magnetic domains, for defining at least one magnetic domain wall; and
means for passing an electric current through the defining means, to selectively shift the magnetic domain wall along the defining means;
wherein shifting the magnetic wall generates a localized fringing field that causes data to be written on a medium that is disposed in proximity to the defining means.
14. The data writing element of claim 13 , wherein the electric current is moved in one direction to write data in a “1” bit.
15. The data writing element of claim 14 , wherein the electric current is moved in an opposite direction to write data in a “0” bit.
16. The data writing element of claim 13 , wherein the defining means comprises a raised section with respect to an adjacent portion, that is disposed in proximity to the medium, to enhance the effect of the fringing field from the domain wall.
17. The data writing element of claim 13 , wherein the medium comprises a shift register.
18. The data writing element of claim 17 , wherein the shift register comprises a plurality of magnetic domains for storing the data.
19. The data writing element of claim 18 , wherein the shifting of the magnetic wall causes the data to be written in the magnetic domains.
20. The data writing element of claim 13 , wherein the medium comprises a data storage disk.
21. The data writing element of claim 13 , wherein the defining means comprises a plurality of domains.
22. The data writing element of claim 21 , further comprising means for pinning at least some of the domains.
23. The data writing element of claim 13 , wherein the means for defining at least one magnetic domain wall is made, at least in part, of magnetic material having a direction of magnetization; and
wherein the electric current comprises electrons having a spin polarization in the same direction as the direction of magnetization.
24. The data writing element of claim 13 , wherein the means for defining at least one magnetic domain wall is made, at least in part, of magnetic material having a direction of magnetization; and
wherein the electric current comprises electrons having a spin polarization in a direction that is opposite to the direction of magnetization.
25. A method for writing data on a medium that is disposed in proximity to the wire, comprising:
using a wire that comprises magnetic domains, for defining at least one magnetic domain wall; and
passing an electric current through the wire, to selectively shift the magnetic domain wall along the wire;
wherein shifting the magnetic wall generates a localized fringing field that causes data to be written on the medium.
26. The method of claim 25 , wherein passing the electric current comprises moving the electric current in one direction to write data in a “1” bit.
27. The method of claim 26 , wherein passing the electric current comprises moving the electric current in an opposite direction to write data in a “0” bit.
28. The method of claim 25 , wherein the wire comprises a raised section with respect to an adjacent portion that is disposed in proximity to the medium, to enhance the effect of the fringing field from the domain wall.
29. The method of claim 25 , wherein the medium comprises a shift register.
30. The method of claim 29 , wherein the shift register comprises a plurality of magnetic domains for storing the data.
31. The method of claim 30 , wherein the shifting of the magnetic wall causes the data to be written in the magnetic domains.
32. The method of claim 25 , wherein the medium comprises a data storage disk.
33. The method of claim 25 , wherein the wire comprises a plurality of domains.
34. The method of claim 33 , further comprising means for pinning at east some of the domains.
35. A data writing element for writing data on a medium that is disposed in proximity to the data writing element, comprising:
a wire that comprises a plurality of magnetic domains that define a plurality of magnetic domain walls along the wire;
an input for passing an electric current through the wire, to selectively shift the magnetic domain walls along the wire; and
wherein shifting the magnetic walls generates a localized fringing field that causes data to be selectively written on the medium by the localized fringing field.