Systems and methods for magnetic shielding

Patent metadata

Field	Value
Publication number	US-9465401-B2
Application number	US-201313863962-A
Country	US
Kind code	B2
Filing date	Apr 16, 2013
Priority date	Mar 23, 2010
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

Systems and methods for magnetic shielding are described. A magnetic shield formed of a material having a high magnetic permeability may be degaussed using a toroidal degaussing coil. The toroidal degaussing coil may enclose at least a portion of the shield. Magnetic field gradients may be actively compensated using multiple magnetic field sensors and local compensation coils. Trapped fluxons may be removed by an application of Lorentz force wherein an electrical current is passed through a superconducting plane.

First claim

The invention claimed is:

1. A system for compensating for a magnetic field gradient within the environment of a processor chip, the system comprising:
at least two magnetic field sensors integrated into the processor chip and respectively positioned at opposite ends of the processor chip;
at least two compensation coils adjacent to the processor chip and respectively positioned proximate opposite ends of the processor chip; and
at least a first current source.

2. The system for compensating for a magnetic field gradient from claim 1 wherein the at least two compensation coils are electrically coupled in series with one another and both coupled to the first current source.

3. The system for compensating for a magnetic field gradient from claim 1 , further comprising a second current source, wherein a first compensation coil is electrically coupled to the first current source and a second compensation coil is electrically coupled to the second current source.

4. The system for compensating for a magnetic field gradient from claim 1 wherein the at least two compensation coils are respectively positioned proximate opposite ends along a width of the processor chip, and further comprising:
at least two additional compensation coils adjacent to the processor chip and respectively positioned proximate opposite ends along a length of the processor chip.

5. The system for compensating for a magnetic field gradient from claim 4 wherein the at least two magnetic field sensors are respectively positioned at opposite ends along the width of the processor chip, and further comprising at least two additional magnetic field sensors integrated into the processor chip that are respectively positioned at opposite ends along the length of the processor chip.

6. The system of claim 1 wherein the processor chip is a superconducting processor chip.

7. The system of claim 1 wherein the at least two magnetic field sensors are on-chip magnetometers.

Assignees

• D Wave Systems Inc

Inventors

• Uchaykin Sergey V

Classifications

• G05F7/00 Primary

  Regulating magnetic variables · CPC title

• H05K9/0071

  Active shielding · CPC title

• H01F13/006 Primary

  Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material (for erasing of information on magnetic record carriers G11B5/00) · CPC title

• H01L39/04

  Electricity · mapped topic

• H10N60/80 Primary

  Constructional details · CPC title