Magnetic memory device
According to the embodiment, a magnetic memory device includes a magnetic body. The magnetic body includes first and second extending regions, and a first connecting region. The first extending region spreads along a first direction and along a second direction crossing the first direction, and includes first and second end portions extending in the first direction. The second end portion is separated from the first end portion in the second direction. The second extending region spreads along the first direction and along a third direction crossing the first direction, and includes third and fourth end portions extending in the first direction. The fourth end portion is separated from the third end portion in the third direction. The first connecting region is provided between the first and third end portions, and connects the first end portion with the third end portion.
1. A magnetic memory device, comprising:
a magnetic body, the magnetic body including
a first extending region, a first length of the first extending region along a first direction being longer than a second length of the first extending region along a second direction crossing the first direction, the first extending region including a first end portion extending in the first direction and a second end portion extending in the first direction and separated from the first end portion in the second direction,
a second extending region, a third length of the second extending region along the first direction being longer than a fourth length of the second extending region along a third direction crossing the first direction, the second extending region including a third end portion extending in the first direction and a fourth end portion extending in the first direction and separated from the third end portion in the third direction, and
a first connecting region provided between the first end portion and the third end portion, a length of the first connection region along the first direction being longer than a length of the first connection region along the second direction and longer than a length of the first connection region along the third direction, the first connecting region connecting the first end portion with the third end portion,
a position of the second end portion along a fourth direction being different from a position of the fourth end portion along the fourth direction, the fourth direction being perpendicular to the first direction and the second direction, and
the first extending region including a first magnetic domain and a first other region provided around the first magnetic domain in a first state.
2. The device according to claim 1 , wherein the third direction crosses the second direction.
3. The device according to claim 1 , wherein an angle between the second direction and the third direction is not larger than 90 degrees.
4. The device according to claim 1 , wherein
the third direction aligns along the second direction, and
at least a part of the second extending region overlaps the first extending region in the fourth direction.
5. The device according to claim 1 , wherein
the third direction aligns along the second direction, and
a position of the first end portion in the second direction is located between a position of the second end portion in the second direction and a position of the fourth end portion in the second direction.
6. The device according to claim 5 , wherein
the first connecting region includes
a first curved part connected with the first end portion,
a second curved part connected with the third end portion, and
a connecting part connected with the first curved part and the second curved part.
7. The device according to claim 1 , further comprising a first counter body separated from a first part of the first extending region, the first counter body being magnetic.
8. The device according to claim 7 , wherein
an electrical resistance between the first extending region and the first counter body in a state where the first magnetic domain is located at the first part is different from an electrical resistance between the first extending region and the first counter body in a state where the first other region is located at the first part.
9. The device according to claim 1 , further comprising
a first control magnetic body connected with the first extending region; and
a first counter body opposing the first control magnetic body.
10. The device according to claim 7 , wherein
the first counter body performs at least one of a first operation or a second operation,
the first counter body creates an other magnetic domain in the first extending region in the first operation, the first other region being provided further around the other magnetic domain,
the first counter body removes the first magnetic domain from the first extending region to create a state different from the first state in the second operation.
11. The device according to claim 9 , further comprising
a first electrode electrically connected with the magnetic body; and
a second electrode electrically connected with the first control magnetic body.
12. The device according to claim 1 , further comprising
a first electrode; and
a second electrode,
the first extending region including
a first end region, and
a second end region arranged with the first end region in the first direction, the first electrode being connected with the first end region, and
the second electrode being connected with the second end region.
13. The device according to claim 11 , wherein
the first magnetic domain moves in the first extending region along the first direction depending on a current flowing in the first extending region, and
the current flows in the first extending region along the first direction.
14. The device according to claim 1 , further comprising:
a first electrode; and
a second electrode,
the first electrode and second electrode being electrically connected with the magnetic body,
a position of the first extending region in the second direction being disposed between a position of the first electrode in the second direction and a position of the second electrode in the second direction,
a position of the second extending region in the second direction being disposed between the position of the first extending region in the second direction and the position of the second electrode in the second direction.
15. The device according to claim 14 , wherein
the first magnetic domain moves in the first extending region along the first direction depending on a current flowing in the first extending region, and
the current flows in the first extending region along the second direction.
16. The device according to claim 1 , wherein a direction of a magnetization of the first magnetic domain is opposite to a direction of a magnetization of the first other region.
17. The device according to claim 1 , wherein the first extending region has a magnetization along a direction perpendicular to the first direction and second direction.
18. The device according to claim 1 , wherein
the first extending region includes a plurality of wide regions and a plurality of narrow regions alternately arranged with the wide regions along the first direction, and
a width of each of the wide regions in the second direction is wider than a width of each of the narrow regions in the second direction.
19. The device according to claim 1 , wherein
the first length is longer than a length of the first extending region along the fourth direction, and
the third length is longer than a length of the second extending region along a direction perpendicular to the first direction and the third direction.