Magnetic memory
A magnetic memory according to an embodiment includes: a magnetic member having a cylindrical form, the magnetic member including a first end portion and a second end portion and extending in a first direction from the first end portion to the second end portion, the first end portion having an end face, which includes a face inclined with respect to a plane perpendicular to the first direction.
1. A magnetic memory comprising:
a magnetic member having a cylindrical form extending in a first direction along a central axis of the magnetic member and having an inside surface and an outside surface, the magnetic member including a first end portion and a second end portion opposite to the first end portion in the first direction, the first end portion having an end face, which includes a face inclined with respect to a plane perpendicular to the first direction, the face of the end face crossing the outside surface and the inside surface;
a nonmagnetic insulating material extending in the first direction, and being provided in the cylindrical form of the magnetic member and being surrounded by the inside surface of the first end portion;
a first electrode electrically connected to the first end portion; and
a second electrode electrically connected to the second end portion.
2. The magnetic memory according to claim 1 , wherein the first end portion includes a first portion and a second portion that is closer to the second end portion than the first portion in the first direction, a first cross-sectional area of the first portion in a plane that is perpendicular to the first direction being smaller than a second cross-sectional area of the second portion in a plane perpendicular to the first direction.
3. The magnetic memory according to claim 2 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction being constant along the first direction from the first portion to the second portion.
4. The magnetic memory according to claim 2 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction increasing along the first direction from the first portion to the second portion.
5. The magnetic memory according to claim 1 further comprising:
a first magnetic layer extending in a second direction that crosses the first direction, the first magnetic layer being connected to the first end portion;
a second magnetic layer disposed to face at least part of the first magnetic layer; and
a nonmagnetic layer disposed between the at least part of first magnetic layer and the second magnetic layer.
6. The magnetic memory according to claim 1 , further comprising:
a magnetic layer extending in a second direction that crosses the first direction, the magnetic layer being connected to the first end portion; and
a field line that writes information to the magnetic layer.
7. The magnetic memory according to claim 1 , further comprising:
a magnetic layer disposed to face an inner face of the first end portion; and
a nonmagnetic layer disposed between the magnetic layer and the inner face of the first end portion.
8. The magnetic memory according to claim 1 , further comprising a field line that writes information to the first end portion.
9. The magnetic memory according to claim 5 , further comprising:
a circuit configured to supply a current to the magnetic member via the first electrode and the second electrode,
wherein the first electrode is electrically connected to one of the first magnetic layer and the second magnetic layer.
10. The magnetic memory according to claim 1 , further comprising a circuit electrically connected to the first electrode and the second electrode, the circuit configured to supply a current to the magnetic member via the first electrode and the second electrode to move a domain wall in the magnetic member.
11. A magnetic memory comprising:
a magnetic member having a cylindrical form extending in a first direction along a central axis of the magnetic member and having an inside surface and an outside surface, the magnetic member including a first end portion and a second end portion opposite to the first end portion in the first direction, the first end portion having an end face, which includes a first face that crosses the first direction and a second face that is different from the first face, the second face crossing the first direction and the first and second faces crossing the outside surface and the inside surface;
a nonmagnetic insulating material extending in the first direction, and being provided in the cylindrical form of the magnetic member and being surrounded by the inside surface of the first end portion;
a first electrode electrically connected to the first end portion; and
a second electrode electrically connected to the second end portion.
12. The magnetic memory according to claim 11 , wherein the first face and the second face are connected to each other, and an angle at which the first face crosses the first direction is different from an angle at which the second face crosses the first direction.
13. The magnetic memory according to claim 11 , wherein the first end portion includes a first portion and a second portion that is closer to the second end portion than the first portion in the first direction, a first cross-sectional area of the first portion in a plane perpendicular to the first direction being smaller than a second cross-sectional area of the second portion in a plane perpendicular to the first direction.
14. The magnetic memory according to claim 13 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction being constant along the first direction from the first portion to the second portion.
15. The magnetic memory according to claim 13 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction increasing along the first direction from the first portion to the second portion.
16. The magnetic memory according to claim 11 , further comprising:
a magnetic layer disposed to face an inner face of the first end portion; and
a nonmagnetic layer disposed between the magnetic layer and the inner face of the first end portion.
17. The magnetic memory according to claim 11 , further comprising a field line that writes information to the first end portion.
18. The magnetic memory according to claim 11 , further comprising a circuit electrically connected to the first electrode and the second electrode, the circuit configured to supply a current to the magnetic member via the first electrode and the second electrode to move a domain wall in the magnetic member.
19. A magnetic memory comprising:
a nonmagnetic insulating material extending in a first direction;
a magnetic member extending in the first direction and surrounding the nonmagnetic insulating material, the magnetic member having a cylindrical form and having an inside surface and an outside surface, the first direction being parallel to a central axis of the magnetic member, the magnetic member including a first end portion and a second end portion opposite to the first end portion in the first direction, the first end portion having an end face, which includes a face inclined with respect to a plane perpendicular to the first direction, the face of the end face crossing the outside surface and the inside surface;
a first electrode electrically connected to the first end portion; and
a second electrode electrically connected to the second end portion,
wherein the nonmagnetic insulating material is surrounded by the first end portion.
20. The magnetic memory according to claim 19 , wherein the first end portion includes a first portion and a second portion that is closer to the second end portion than the first portion in the first direction, a first cross-sectional area of the first portion in a plane perpendicular to the first direction being smaller than a second cross-sectional area of the second portion in a plane perpendicular to the first direction.
21. The magnetic memory according to claim 20 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction being constant along the first direction from the first portion to the second portion.
22. The magnetic memory according to claim 20 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction increasing along the first direction from the first portion to the second portion.
23. The magnetic memory according to claim 19 , further comprising:
a first magnetic layer extending in a second direction that crosses the first direction, the first magnetic layer being connected to the first end portion;
a second magnetic layer disposed to face at least part of the first magnetic layer; and
a nonmagnetic layer disposed between the at least part of first magnetic layer and the second magnetic layer.
24. The magnetic memory according to claim 19 , further comprising:
a magnetic layer extending in a second direction that crosses the first direction, the magnetic layer being connected to the first end portion; and
a field line that writes information to the magnetic layer.
25. The magnetic memory according to claim 19 , further comprising:
a magnetic layer disposed to face an inner face of the first end portion; and
a nonmagnetic layer disposed between the magnetic layer and the inner face of the first end portion.
26. The magnetic memory according to claim 19 , further comprising a field line that writes information to the first end portion.
27. The magnetic memory according to claim 23 , further comprising:
a circuit configured to supply a current to the magnetic member via the first electrode and the second electrode,
wherein the first electrode is electrically connected to one of the first magnetic layer and the second magnetic layer.
28. The magnetic memory according to claim 19 , further comprising a circuit electrically connected to the first electrode and the second electrode, the circuit configured to supply a current to the magnetic member via the first electrode and the second electrode to move a domain wall in the magnetic member.
29. A magnetic memory comprising:
a nonmagnetic insulating material extending in a first direction;
a magnetic member extending in the first direction and surrounding the nonmagnetic insulating material, the magnetic member having a cylindrical form and having an inside surface and an outside surface, the first direction being parallel to a central axis of the magnetic member, the magnetic member including a first end portion and a second end portion opposite to the first end portion in the first direction, the first end portion having an end face, which includes a first face that crosses the first direction and a second face that is different from the first face, the second face crossing the first direction and the first and second faces crossing the outside surface and the inside surface;
a first electrode electrically connected to the first end portion; and
a second electrode electrically connected to the second end portion,
wherein the nonmagnetic insulating material is surrounded by the first end portion.
30. The magnetic memory according to claim 29 , wherein the first face and the second face connect to each other, and an angle at which the first face crosses the first direction is different from an angle at which the second face crosses the first direction.
31. The magnetic memory according to claim 29 , wherein the first end portion includes a first portion and a second portion that is closer to the second end portion than the first portion in the first direction, a first cross-sectional area of the first portion in a plane perpendicular to the first direction being smaller than a second cross-sectional area of the second portion in a plane perpendicular to the first direction.
32. The magnetic memory according to claim 31 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction is constant along the first direction from the first portion to the second portion.
33. The magnetic memory according to claim 31 , wherein the first end portion includes a part, a cross-sectional area of the part in a plane perpendicular to the first direction increasing along the first direction from the first portion to the second portion.
34. The magnetic memory according to claim 29 , further comprising:
a magnetic layer disposed to face an inner face of the first end portion; and
a nonmagnetic layer disposed between the magnetic layer and the inner face of the first end portion.
35. The magnetic memory according to claim 29 , further comprising a field line that writes information to the first end portion.
36. The magnetic memory according to claim 29 , further comprising a circuit electrically connected to the first electrode and the second electrode, the circuit configured to supply a current to the magnetic member via the first electrode and the second electrode to move a domain wall in the magnetic member.