US 11,963,461 B2
Magnetic domain wall movement element and magnetic recording array
Takuya Ashida, Tokyo (JP); and Tatsuo Shibata, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on May 26, 2021, as Appl. No. 17/331,211.
Claims priority of application No. 2020-091151 (JP), filed on May 26, 2020; and application No. 2021-048982 (JP), filed on Mar. 23, 2021.
Prior Publication US 2021/0376229 A1, Dec. 2, 2021
Int. Cl. H10N 50/80 (2023.01); H10B 61/00 (2023.01)
CPC H10N 50/80 (2023.02) [H10B 61/22 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A magnetic domain wall movement element comprising:
a substrate, a first ferromagnetic layer, a nonmagnetic layer, and a second ferromagnetic layer, wherein
the first ferromagnetic layer, the nonmagnetic layer, and the second ferromagnetic layer are laminated in this order, and the first ferromagnetic layer is provided on a side of the substrate from the second ferromagnetic layer,
in the magnetic domain wall movement element, a lamination direction is a direction of laminating the first ferromagnetic layer, the nonmagnetic layer, and the second ferromagnetic layer, a first direction is a direction along with a long axis of the first ferromagnetic layer in a plan view from the lamination direction, and a second direction is a direction along with a short axis of the first ferromagnetic layer in the plan view,
on a cross-section along the lamination direction and the second direction orthogonal to the first direction, a shortest width of the first ferromagnetic layer in the second direction is shorter than a width of the nonmagnetic layer in the second direction, and
a writing current flows along the first direction of the second ferromagnetic layer.