Random number generator, random number generation device, neuromorphic computer, and quantum computer

Patent metadata

Field	Value
Publication number	US-10340901-B2
Application number	US-201815891759-A
Country	US
Kind code	B2
Filing date	Feb 8, 2018
Priority date	Mar 1, 2017
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A random number generator capable of generating a natural random number using a spin-orbit torque (SOT) is provided. The random number generator includes a ferromagnetic metal layer and a spin-orbit torque wiring extending in a first direction crossing a lamination direction of the ferromagnetic metal layer and being joined to the ferromagnetic metal layer, wherein the direction of spins injected from the spin-orbit torque wiring into the ferromagnetic metal layer and an easy magnetization direction of the ferromagnetic metal layer intersect each other.

First claim

What is claimed is:

1. A random number generator comprising:
a ferromagnetic metal layer;
a spin-orbit torque wiring extending in a first direction intersecting a lamination direction of the ferromagnetic metal layer and being joined to the ferromagnetic metal layer; and
an external magnetic field applying part configured to apply a magnetic field to the ferromagnetic metal layer;
wherein a direction of spin injected from the spin-orbit torque wiring into the ferromagnetic metal layer and an easy magnetization direction of the ferromagnetic metal layer intersect each other.

2. The random number generator according to claim 1 , wherein the direction of the spin injected from the spin-orbit torque wiring into the ferromagnetic metal layer and the easy magnetization direction of the ferromagnetic metal layer are inclined between 45 degrees and 90 degrees with respect to each other.

3. The random number generator according to claim 2 , wherein a plurality of the ferromagnetic metal layers are joined to the spin-orbit torque wiring.

4. A random number generation device comprising:
the random number generator according to claim 2 ; and
a current applying part configured to apply a current to the spin-orbit torque wiring of the random number generator.

5. A neuromorphic computer including the random number generator according to claim 2 .

6. A quantum computer including the random number generator according to claim 2 .

7. The random number generator according to claim 1 , wherein the direction of the spin injected from the spin-orbit torque wiring into the ferromagnetic metal layer and the easy magnetization direction of the ferromagnetic metal layer are orthogonal to each other.

8. The random number generator according to claim 1 , wherein a plurality of the ferromagnetic metal layers are joined to the spin-orbit torque wiring.

9. The random number generator according to claim 1 , wherein a nonmagnetic layer and a second ferromagnetic metal layer are provided in order on a surface of the ferromagnetic metal layer opposite to the spin-orbit torque wiring.

10. The random number generator according to claim 2 , wherein a nonmagnetic layer and a second ferromagnetic metal layer are provided in order on a surface of the ferromagnetic metal layer opposite to the spin-orbit torque wiring.

11. A random number generation device comprising:
the random number generator according to claim 1 ; and
a current applying part configured to apply a current to the spin-orbit torque wiring of the random number generator.

12. A neuromorphic computer including the random number generator according to claim 1 .

13. A quantum computer including the random number generator according to claim 1 .

14. A random number generator comprising:
a ferromagnetic metal layer;
a spin-orbit torque wiring extending in a first direction intersecting a lamination direction of the ferromagnetic metal layer and being joined to the ferromagnetic metal layer; and
a magnetic shield sandwiching or surrounding the ferromagnetic metal layer and the spin-orbit torque wiring;
wherein a direction of spin injected from the spin-orbit torque wiring into the ferromagnetic metal layer and an easy magnetization direction of the ferromagnetic metal layer intersect each other.

15. The random number generator according to claim 14 , wherein the direction of the spin injected from the spin-orbit torque wiring into the ferromagnetic metal layer and the easy magnetization direction of the ferromagnetic metal layer are orthogonal to each other.

16. The random number generator according to claim 14 , wherein a plurality of the ferromagnetic metal layers are joined to the spin-orbit torque wiring.

17. The random number generator according to claim 14 , wherein a nonmagnetic layer and a second ferromagnetic metal layer are provided in order on a surface of the ferromagnetic metal layer opposite to the spin-orbit torque wiring.

18. The random number generator according to claim 14 , wherein the direction of the spin injected from the spin-orbit torque wiring into the ferromagnetic metal layer and the easy magnetization direction of the ferromagnetic metal layer are inclined between 45 degrees and 90 degrees with respect to each other.

19. The random number generator according to claim 18 , wherein a plurality of the ferromagnetic metal layers are joined to the spin-orbit torque wiring.

20. The random number generator according to claim 18 , wherein a nonmagnetic layer and a second ferromagnetic metal layer are provided in order on a surface of the ferromagnetic metal layer opposite to the spin-orbit torque wiring.

21. A random number generation device comprising:
the random number generator according to claim 18 ; and
a current applying part configured to apply a current to the spin-orbit torque wiring of the random number generator.

22. A neuromorphic computer including the random number generator according to claim 18 .

23. A quantum computer including the random number generator according to claim 18 .

24. A random number generation device comprising:
the random number generator according to claim 14 ; and
a current applying part configured to apply a current to the spin-orbit torque wiring of the random number generator.

25. A neuromorphic computer including the random number generator according to claim 14 .

26. A quantum computer including the random number generator according to claim 14 .

Assignees

• Tdk Corp

Inventors

• Yoshinari Jiro
• Sasaki Tomoyuki
• SHIOKAWA Yohei

Classifications

• G06N3/065

  Analogue means · 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

• H01F10/3254

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

• G06F7/588

  Random number generators, i.e. based on natural stochastic processes · CPC title

• H03K3/84 Primary

  Generating pulses having a predetermined statistical distribution of a parameter, e.g. random pulse generators · CPC title