Storage element and memory

Patent metadata

Field	Value
Publication number	US-10475989-B2
Application number	US-201816156736-A
Country	US
Kind code	B2
Filing date	Oct 10, 2018
Priority date	Dec 12, 2006
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A storage element includes a storage layer, a fixed magnetization layer, a spin barrier layer, and a spin absorption layer. The storage layer stores information based on a magnetization state of a magnetic material. The fixed magnetization layer is provided for the storage layer through a tunnel insulating layer. The spin barrier layer suppresses diffusion of spin-polarized electrons and is provided on the side of the storage layer opposite the fixed magnetization layer. The spin absorption layer is formed of a nonmagnetic metal layer causing spin pumping and provided on the side of the spin barrier layer opposite the storage layer. A direction of magnetization in the storage layer is changed by passing current in a layering direction to inject spin-polarized electrons so that information is recorded in the storage layer and the spin barrier layer includes at least a material selected from oxides, nitrides, and fluorides.

First claim

The invention is claimed as follows:

1. A storage device comprising:
a first magnetization layer having a first magnetization state;
a second magnetization layer having a second magnetization state;
an intermediate layer provided between the first magnetization layer and the second magnetization layer;
a spin absorption layer configured to increase spin pumping of the first magnetization layer; and
a spin barrier layer configured to suppress spin pumping of the first magnetization layer,
wherein the second magnetization layer includes a first layer having a first magnetization direction and a second layer having a second magnetization direction, and
wherein the spin barrier layer is provided between the spin absorption layer and the first magnetization layer.

2. The storage device according to claim 1 , wherein the first magnetization direction is opposite to the second magnetization direction.

3. The storage device according to claim 1 , wherein a thickness of the first magnetization layer is from 1 nm to 5 nm.

4. The storage device according to claim 1 , wherein the first magnetization layer includes Co, Fe, and B.

5. The storage device according to claim 1 , wherein the intermediate layer includes at least one of magnesium oxide, aluminum oxide, aluminum nitride, SiO2, Bi2O3, MgF2, CaF, SrTiO2, AlLaO3, and AlNO.

6. The storage device according to claim 1 , wherein the second magnetization layer includes Co, Fe, and B.

7. The storage device according to claim 1 , wherein the first magnetization state of the first magnetization layer is configured to be changed by passing a current through the first magnetization layer.

8. The storage device according to claim 1 , wherein the spin barrier layer includes at least one of an oxide, a nitride and a fluoride.

9. The storage device according to claim 1 , wherein the spin barrier layer is provided adjacent to the spin absorption layer and the spin barrier layer is provided adjacent to the first magnetization layer.

10. The storage device according to claim 1 , wherein an area of the storage element is less than or equal to 0.04 μm2.

11. The storage device according to claim 1 , wherein the second magnetization layer has an exchange-bias layered ferromagnetic structure.

12. The storage device according to claim 1 , further comprising an underlayer provided adjacent to the second magnetization layer, and wherein the underlayer includes Tantalum.

13. A memory comprising:
a storage device; and
at least two lines that intersect with each other,
wherein the storage device includes
a first magnetization layer having a first magnetization state;
a second magnetization layer having a second magnetization state;
an intermediate layer provided between the first magnetization layer and the second magnetization layer;
a spin absorption layer configured to increase spin pumping of the first magnetization layer; and
a spin barrier layer configured to suppress spin pumping of the first magnetization layer,
wherein the second magnetization layer includes a first layer having a first magnetization direction and a second layer having a second magnetization direction, and
wherein the spin barrier layer is provided between the spin absorption layer and the first magnetization layer.

14. The memory according to claim 13 , wherein the first magnetization direction is opposite to the second magnetization direction.

15. The memory according to claim 13 , wherein a thickness of the first magnetization layer is from 1 nm to 5 nm.

16. The memory according to claim 13 , wherein the first magnetization layer includes Co, Fe, and B.

17. The memory according to claim 13 , wherein the intermediate layer includes at least one of magnesium oxide, aluminum oxide, aluminum nitride, SiO2, Bi2O3, MgF2, CaF, SrTiO2, AlLaO3, and AlNO.

18. The memory according to claim 13 , wherein the first magnetization layer is a CoFeB/Ta/CoFeB layered film.

Assignees

• Sony Corp

Inventors

• Higo Yutaka
• Hosomi Masanori
• Ohmori Hiroyuki
• Yamamoto Tetsuya
• Yamane Kazutaka
• Oishi Yuki
• Kano Hiroshi

Classifications

• G11C11/161 Primary

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

• B82Y25/00 Primary

  Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance · CPC title

• H01F10/329

  Spin-exchange coupled multilayers wherein the magnetisation of the free layer is switched by a spin-polarised current, e.g. spin torque effect · CPC title

• H01F10/3272

  by use of anti-parallel coupled [APC] ferromagnetic layers, e.g. artificial ferrimagnets [AFI], artificial [AAF] or synthetic [SAF] anti-ferromagnets · CPC title

• H01F10/3254

  the spacer being semiconducting or insulating, e.g. for spin tunnel junction [STJ] · CPC title