Magnetic device including spin sinker

Patent metadata

Field	Value
Publication number	US-11322190-B2
Application number	US-202017127414-A
Country	US
Kind code	B2
Filing date	Dec 18, 2020
Priority date	Jul 30, 2020
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Disclosed is a magnetic device including a spin sinker. The magnetic device includes a storage medium, a spin sinker, and a read node. The storage medium receives an in-plane current from outside and generates a self-generated spin current that perpendicularly flows to a charge current, thereby controlling a data structure with the self-generated spin current. The spin sinker receives and attenuates the spin current. The read node measures a magnetoresistance of a data structure through the storage medium. The storage medium is made of a magnetic metal and the spin sinker is made of a magnetic insulating material.

First claim

What is claimed is:

1. A magnetic device including a spin sinker, the magnetic device comprising:
a storage medium that receives an in-plane current from the outside thereof and generates a self-generated spin current that flows perpendicularly to a charge current that is the in-plane current and controls a data structure with the self-generated spin current;
a spin sinker that receives the self-generated spin current from the storage medium and attenuates the self-generated spin current; and
a read node that measures a magnetoresistance of the data structure through the storage medium,
wherein the storage medium is made of a magnetic metal,
the spin sink is made of a magnetic insulating material, and
the read node reads data “1” or data “0” according to a presence type of the structure or according to presence or absence of the data structure in the storage medium.

2. The magnetic device according to claim 1 , wherein the spin sink is disposed on the storage medium in a manner that the spin sink is in direct contact with the storage medium, and
the read node is disposed under the storage medium in a manner that the read node is in direct contact with the storage medium.

3. The magnetic device according to claim 2 , wherein the storage medium comprises a single layer made of a ferromagnetic metal, a ferrimagnetic metal, or an antiferromagnetic metal, and
the spin sinker comprises a single layer made of a ferromagnetic insulating material, a ferrimagnetic insulating material, or an anti-ferromagnetic insulating material.

4. The magnetic device according to claim 2 , wherein the storage medium comprises a plurality of layers each of which is made of a ferromagnetic metal, a ferrimagnetic metal, or an anti-ferromagnetic metal, and
the spin sinker comprises a single layer made of a ferromagnetic insulating material, a ferrimagnetic insulating material, or an anti-ferromagnetic insulating material.

5. The magnetic device according to claim 2 , wherein the storage medium comprises a single layer made of a ferromagnetic metal, a ferrimagnetic metal, or an anti-ferromagnetic metal, and
the spin sinker comprises a plurality of layers each of which is made of a ferromagnetic insulating material, a ferrimagnetic insulating material, or an anti-ferromagnetic insulating material.

6. The magnetic device according to claim 2 , wherein the storage medium comprises a plurality of layers each of which is made of a ferromagnetic metal, a ferrimagnetic metal, or an anti-ferromagnetic metal, and
the spin sinker comprises a plurality of layers each of which is made of a ferromagnetic insulating material, a ferrimagnetic insulating material, or an anti-ferromagnetic insulating material.

7. The magnetic device according to claim 2 , wherein the storage medium comprises at least one of Fe, Co, Ni, B, Si, Zr, Pt, Tb, Pd, Cu, W, Ta, Gd, Ir, Mn, Cr, I, Ge, and Te, and
the spin sinker comprises at least one of Fe, Co, Ni, Mn, Y, Tm, Gd, Eu, S, N, O, Ba, Cr, Ge, and Te.

8. The magnetic device according to claim 2 , further comprising a write node that is disposed on one side of the storage medium and under the spin sinker and is in electrical contact with the storage medium,
wherein the write node receives power from the outside of the storage medium and supplies the in-plane current to the storage medium.

9. The magnetic device according to claim 2 , wherein the read node comprises a tunnel barrier and a ferromagnetic layer sequentially stacked on the storage medium and electrically measures the magnetoresistance corresponding to data “1” or data “0” at a position directly under the read node during movement of the data structure in the storage medium.

10. The magnetic device according to claim 2 , wherein the data structure comprises a magnetic domain wall, a magnetic vortex, a magnetic skyrmion, or a magnetic skyrmion derivative structure, and
the magnetic skyrmion derivative structure comprises a magnetic skyrmionium or a magnetic hopfion.

11. The magnetic device according to claim 1 , further comprising an electrical insulator disposed around the storage medium and the spin sinker when the spin sinker is stacked on the storage medium,
wherein the storage medium and the spin sinker that are stacked constitutes a stack unit, and
the electrical insulator is positioned between a lower stack unit and an upper stack unit of the stack units adjacent to each other and is thus in direct contact with the spin sinker of the lower stack unit and with the storage medium of the upper stack unit, and
the electrical insulator prevents the self-generated spin current from flowing from the spin sinker of the lower stack unit to the storage medium of the upper stack unit.

12. The magnetic device according to claim 11 , wherein each of the storage medium and the spin sinker comprises at least one layer, and the storage medium and the spin sinker comprise the same number of layers.

13. The magnetic device according to claim 11 , wherein each of the storage medium and the spin sinker comprises at least one layer, and the storage medium and the spin sinker comprise different number of layers.

14. The magnetic device according to claim 11 , wherein the storage medium is made of a ferromagnetic metal, ferrimagnetic metal, or anti-ferromagnetic metal, including at least one of Fe, Co, Ni, B, Si, Zr, Pt, Tb, Pd, Cu, W, Ta, Gd, Ir, Mn, Cr, I, Ge, and Te, and
the spin sinker is made of a ferromagnetic insulating material, ferrimagnetic insulating material, or anti-ferromagnetic insulating material, including at least one of Fe, Co, Ni, Mn, Y, Tm, Gd, Eu, S, N, O, Ba, Cr, Ge, and Te.

15. The magnetic device according to claim 11 , further comprising:
a write node positioned around the storage medium;
a write selection circuit electrically connected to the write node; and
a read selection circuit electrically connected to the read node,
wherein each of the write node and the read node is electrically connected to the storage medium of each of the stack units and comprises a switching circuit for each of the stack units, and the switching circuits for the respective stack units can be individually switched on and off when a read operation or a write operation is performed on the storage medium of each of the stack units.

16. The magnetic device according to claim 15 , wherein the write node supplies the in-plane current to the storage medium for each stack unit, and
the read node comprises a tunnel barrier and a ferromagnetic layer disposed around the storage medium of each of the stack units, and the read node electrically measures a magnetoresistance corresponding to the data “1” or the data “0” from the storage medium during movement of the data structure in the storage medium.

17. The magnetic device according to claim 15 , wherein the write selection circuit and the read selection circuit selects the write node for each of the stack units and the read node for each of the stack units and supplies power to the write node for each of the stack units and the read node for each of the stack units.

18. The magnetic device according to claim 11 , wherein the data structure comprises a magnetic domain wall, a magnetic vortex, a magnetic skyrmion, or a magnetic skyrmion derivative structure, and
the magnetic skyrmion derivative structure comprises a magnetic skyrmionium or a magnetic hopfion.

19. The magnetic device according to claim 1 , further comprising a tunnel carrier and a ferromagnetic material sequentially positioned on the spin sinker while the storage

Assignees

• Korea Inst Sci & Tech

Inventors

• Kim Kyoung Whan
• Han Dong Soo

Classifications

• H10N50/85

  Materials of the active region · CPC title

• G11C11/1675

  Writing or programming circuits or methods · CPC title

• G11C11/18

  using Hall-effect devices · CPC title

• G11C11/161 Primary

  details concerning the memory cell structure, e.g. the layers of the ferromagnetic memory cell · CPC title

• G11C11/1673

  Reading or sensing circuits or methods · CPC title