# US 12,604,482 B2 · Magnetic domain wall moving element and magnetic recording array > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,482 B2 - Document ID: US12604482B2 - Status: Granted - Kind: B2 - Application number: 17/610,339 - Filed: 2020-05-12 - Published: 2022-07-21 - Granted: 2026-04-14 - Earliest claimed: 2019-05-16 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Tetsuhito Shinohara; Takuya Ashida; Tatsuo Shibata - Web page: https://patentgrep.com/patent/US12604482B2 ## CPC - H10B 61/22: {of the field-effect transistor [FET] type} - G11C 11/161: {details concerning the memory cell structure, e.g. the layers of the ferromagnetic memory cell} - G11C 11/1659: {Cell access} - H10D 48/40: Devices controlled by magnetic fields - H10N 50/10: Magnetoresistive devices - H10N 50/80: Constructional details - H10N 50/85: Materials of the active region - G11C 11/1675: {Writing or programming circuits or methods} - H10B: ELECTRONIC MEMORY DEVICES - G11C: STATIC STORES (semiconductor memory devices H10B) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR ## Abstract A magnetic domain wall moving element includes a magnetic recording layer which extends in a first direction and includes a ferromagnetic material, and a first conductive layer and a second conductive layer which are separately connected to the magnetic recording layer, the first conductive layer includes a ferromagnetic first layer in contact with the magnetic recording layer, the first layer includes a mixing layer at an interface with the magnetic recording layer, a ferromagnetic material and a dissimilar metal are mixed in the mixing layer, and the dissimilar metal is a metal different from each of the ferromagnetic material that mainly constitutes the first layer and the ferromagnetic material that mainly constitutes the magnetic recording layer. ## Claims ### Claim 1 A magnetic domain wall moving element comprising: a magnetic recording layer which extends in a first direction and includes a ferromagnetic material; and a first conductive layer and a second conductive layer which are separately connected to the magnetic recording layer, wherein the first conductive layer includes a first layer that exhibits ferromagnetism and in contact with the magnetic recording layer, the first layer includes a mixing layer at an interface with the magnetic recording layer, a ferromagnetic material and a dissimilar metal are mixed in the mixing layer, when viewed from a laminating direction, the mixing layer includes a plurality of first portions containing the dissimilar metal which is locally distributed and a second portion containing other than dissimilar metal, the dissimilar metal is a metal different from each of the ferromagnetic material that mainly constitutes the first layer and the ferromagnetic material that mainly constitutes the magnetic recording layer, and a magnetization of the first layer is in a same fixed direction as the magnetization of a portion of the magnetic recording layer that overlaps with the first layer in a laminating direction. ### Claim 2 (depends on 1) The magnetic domain wall moving element according to claim 1, wherein the first conductive layer has a second layer that exhibits non-magnetism and a third layer that exhibits ferromagnetism in order on a surface of the first layer opposite to the magnetic recording layer. ### Claim 3 (depends on 1) The magnetic domain wall moving element according to claim 1, wherein the dissimilar metal is a non-magnetic metal. ### Claim 4 (depends on 1) The magnetic domain wall moving element according to claim 1, wherein a concentration of the dissimilar metal is higher on a first surface of the mixing layer on a side closer to the magnetic recording layer than on a second surface opposite to the first surface. ### Claim 5 (depends on 1) The magnetic domain wall moving element according to claim 1, wherein the dissimilar metal has a concentration distribution in the first direction, and a first end of the mixing layer on a side closer to a center of the magnetic recording layer in the first direction has a higher concentration of the dissimilar metal than the second end opposite to the first end. ### Claim 6 (depends on 1) The magnetic domain wall moving element according to claim 1, wherein the dissimilar metal is locally distributed in the mixing layer. ### Claim 7 (depends on 6) The magnetic domain wall moving element according to claim 6, wherein a thickness of the mixing layer varies from place to place due to the first portion. ### Claim 8 (depends on 6) The magnetic domain wall moving element according to claim 6, wherein a surface of the mixing layer is uneven in a laminating direction due to the first portion in which the dissimilar metal is locally distributed. ### Claim 9 (depends on 1) The magnetic domain wall moving element according to claim 1, wherein the magnetic recording layer includes a second mixing layer on a side opposite to a surface connected to the first conductive layer, the ferromagnetic material included in the magnetic recording layer and the dissimilar metal are mixed in the second mixing layer, and the dissimilar metal is a metal different from the ferromagnetic material that mainly constitutes the magnetic recording layer. ### Claim 10 (depends on 1) The magnetic domain wall moving element according to claim 1, wherein the second conductive layer includes a fourth layer that exhibits ferromagnetism and in contact with the magnetic recording layer, the fourth layer includes a third mixing layer at an interface with the magnetic recording layer, a ferromagnetic material and a dissimilar metal are mixed in the third mixing layer, and the dissimilar metal is a metal different from each of the ferromagnetic material that mainly constitutes the fourth layer and the ferromagnetic material that mainly constitutes the magnetic recording layer. ### Claim 11 A magnetic domain wall moving element comprising: a magnetic recording layer which extends in a first direction and includes a ferromagnetic material; and a first conductive layer and a second conductive layer which are separately connected to the magnetic recording layer, wherein the first conductive layer includes a first layer that exhibits ferromagnetism and in contact with the magnetic recording layer, the first layer includes a mixing layer at an interface with the magnetic recording layer, a non-magnetic material and a ferromagnetic material are alternately laminated in the first layer, the ferromagnetic material and the non-magnetic material are mixed in the mixing layer, when viewed from a laminating direction, the mixing layer includes a plurality of first portions containing the non-magnetic material which is locally distributed and a second portion containing other than non-magnetic material, and a magnetization of the first layer is in a same fixed direction as the magnetization of a portion of the magnetic recording layer that overlaps with the first layer in a laminating direction. ### Claim 12 (depends on 1) The magnetic domain wall moving element according to claim 1, further comprising: a first ferromagnetic layer facing the magnetic recording layer; and a non-magnetic layer located between the first ferromagnetic layer and the magnetic recording layer. ### Claim 13 (depends on 1) A magnetic recording array comprising a plurality of magnetic domain wall moving elements according to claim 1.