Spin memory encryption

Patent metadata

Field	Value
Publication number	US-12201029-B2
Application number	US-202217579048-A
Country	US
Kind code	B2
Filing date	Jan 19, 2022
Priority date	Jan 19, 2021
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A topological spin memory effect, defined as the recovery of magnetic skyrmions or magnetic bubble skyrmions in magnetic thin films after a transition to a dramatically different spin texture, is used for encrypted non-volatile information storage. The storage strategy is based on magnetic skyrmions, that is, topologically protected spin textures comprising chiral domain walls surrounding small (e.g., nanometers to microns in diameter), typically circular, single-domain cores. Systems and methods are described for encrypted non-volatile information storage based on a spin memory effect in magnetic thin films that support skyrmions. Systems and methods encrypt and recover information stored in the form of magnetic skyrmions.

First claim

What is claimed:

1. A method comprising:
storing data in a plurality of skyrmions; and
encrypting the data by activating a control parameter to enable a spin reorientation or to distort the plurality of skyrmions.

2. The method of claim 1 , wherein the plurality of skyrmions comprise at least one skyrmion.

3. The method of claim 1 , wherein the plurality of skyrmions are comprised in a multilayer film.

4. The method of claim 3 , wherein the multilayer film comprises a [Co/Gd/Pt] 10 film.

5. The method of claim 1 , wherein the control parameter is at least one of temperature, strain, voltage, current, or magnetic field.

6. The method of claim 1 , wherein the control parameter is temperature.

7. The method of claim 6 , wherein activating the control parameter comprises cooling a film in which the plurality of skyrmions are disposed to below a predetermined temperature.

8. The method of claim 7 , further comprising decrypting the data by warming the film in which the plurality of skyrmions are disposed above the predetermined temperature.

9. The method of claim 1 , wherein encrypting the data comprises using the control parameter to obscure the plurality of skyrmions.

10. The method of claim 9 , further comprising decrypting the data by using the control parameter to recover the plurality of skyrmions.

11. The method of claim 1 , further comprising decrypting the data by using the control parameter to recover the data.

12. The method of claim 11 , further comprising using the decrypted data in one more of a logic application or a skyrmion device application.

Assignees

• Univ Colorado State Res Found
• Bryn Mawr College

Inventors

• Buchanan Kristen
• Wang Xiao
• Cheng Xuemei

Classifications

• H10B61/00

  Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices · CPC title

• H01F10/3222

  Exchange coupled hard/soft multilayers, e.g. CoPt/Co or NiFe/CoSm (nanocomposite spring magnets H01F1/0579) · CPC title

• H10N50/85

  Materials of the active region · CPC title

• H10N50/80

  Constructional details · CPC title

• H01F10/3286

  Spin-exchange coupled multilayers having at least one layer with perpendicular magnetic anisotropy · CPC title