Nanomagnetic composition

• US 6,815,609 B1
• Filed: 04/08/2003
• Issued: 11/09/2004
• Est. Priority Date: 12/18/2002
• Status: Expired due to Fees

• Current Assignee: Biophan Technologies Incorporated
• Original Assignee: Nanoset LLC
• Inventors: Miller, Ronald E., Wang, Xingwu, Greenwald, Howard J.
• Primary Examiner(s): Ngo, Hung V.
• Application Number:
  US10/409,505
• Time in Patent Office: 581 Days
• Field of Search: 174/35.MS, 174/35.R, 361/816, 361/818, 361/800, 428/323, 428/340
• US Class Current: 174/391
• CPC Class Codes: A61N 1/16 Screening or neutralising undesirable influences from or using, atmospheric or terrestrial radiation or fields using atmospheric electricity or earth currents H05F3/00
• CPC Class Codes: B82Y 25/00 Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
• CPC Class Codes: H01B 11/10 Screens specially adapted for reducing interference from external sources
• CPC Class Codes: H01F 1/0063 in a non-magnetic matrix, e.g. granular solids granular films H01F10/007
• CPC Class Codes: H01F 10/007 ultrathin or granular films H01F10/005 and H01F10/3227 take precedence; applying ultrathin or granular layers to substrates H01F41/301
• CPC Class Codes: H01F 10/324 Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer
• CPC Class Codes: Y10T 428/24992 Density or compression of components
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/27 Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]

Abstract

A magnetically shielded substrate assembly includes a substrate and, disposed over the substrate, a magnetic shield with a magnetic shielding factor of at least about 0.5. The magnetic shield has a film of nanomagnetic material containing at least about 40 weight percent of nomagnetic material with a mass density of at least about 0.01 grams per cubic centimeter, a saturization magnetization of from about 1 to about 36,000 Gauss, a coercive force of from about 0.01 to about 5,000 Oersteds, a relative magnetic permeability of from about 1 to about 500,000, and an average particle size of less than about 100 nanometers. This film of nanomagnetic material has a squareness of from about 0.5 to about 1.0.

Claims

1. A magnetically shielded substrate assembly comprised of a substrate and, disposed over such substrate, a magnetic shield, wherein:

(a) said magnetic shield, when exposed to a magnetic field with an intensity of at least 0.5 Teslas, has a magnetic shielding factor of at least about 0.5;

(b) said magnetic shield is comprised of a film of nanomagnetic material comprising at least about 40 weight percent of nanomagnetic material with a mass density of at least about 0.01 grams per cubic centimeter, a saturization magnetization of from about 1 to about 36,000 Gauss, a coercive force of from about 0.01 to about 5,000 Oersteds, a relative magnetic permeability of from about 1 to about 500,000, and an average particle size of less than about 100 nanometers; and

(c) said film of nanomagnetic material has a squareness of from about 0.5 to about 1.0.

4. The magnetically shielded substrate assembly as recited in claim 1, wherein said film of nanomagnetic material has a magnetic anisotropy of less than about 20 degrees.

5. The magnetically shielded substrate assembly as recited in claim 4, wherein said film of nanomagnetic material has a stress of less than about 500 megapascals.

6. The magnetically shielded substrate assembly as recited in claim 5, wherein said film of nanomagnetic material has a surface roughness of less than 4 nanometers.

7. The magnetically shielded substrate assembly as recited in claim 5, wherein said film of nanomagnetic material has a thickness of less than about 2 microns.

8. The magnetically shielded substrate assembly as recited in claim 5, wherein said magnetically shielded conductor assembly has a bend radius of less than 2 centimeters.

9. The magnetically shielded substrate assembly as recited in claim 5, wherein said film of nanomagnetic material has a magnetic shielding factor of at least about 0.9.

10. The magnetically shielded substrate assembly as recited in claim 5, wherein said nanomagnetic material has a coercive force of from about 0.1 to about 10 Oersteds.

11. The magnetically shielded substrate assembly as recited in claim 5, wherein said nanomagnetic material has a relative magnetic permeability of from about 1.5 to about 260,000.

12. The magnetically shielded substrate assembly as recited in claim 5, wherein said nanomagnetic material has a mass density of at least about 1 gram per cubic centimeter.

13. The magnetically shielded substrate assembly as recited in claim 12, wherein said nanomagnetic material has a mass density of at least 3 grams per cubic centimeter.

14. The magnetically shielded substrate assembly as recited in claim 5, wherein said nanomagnetic material is comprised of particles with a particle size of from about 2 to about 50 nanometers.

15. The magnetically shielded substrate assembly as recited in claim 5, wherein said film of nanomagnetic material has a thickness of from about 0.1 to about 3 microns.

16. The magnetically shielded substrate assembly as recited in claim 5, wherein said film of nanomagnetic material has a saturization magnetization of from about 500 to about 10,000 Gauss.

17. The magnetically shielded substrate assembly as recited in claim 5, wherein said film of nanomagnetic material has a saturization magnetization in excess of 20,000 Gauss.

18. The magnetically shielded substrate assembly as recited in claim 5, wherein said nanomagnetic material is disposed within an insulating matrix.

2. A magnetically shielded substrate assembly comprised of a substrate and, disposed over such substrate, a magnetic shield, wherein:

(a) said magnetic shield, when exposed to a magnetic field with an intensity of at least 0.5 Teslas, has a magnetic shielding factor of at least about 0.5;

(b) said magnetic shield is comprised of a film of nanomagnetic material comprising at least about 40 weight percent of nanomagnetic material with a mass density of at least about 0.01 grams per cubic centimeter, a saturization magnetization of from about 1 to about 36,000 Gauss, a coercive force of from about 0.01 to about 5,000 Oersteds, a relative magnetic permeability of from about 1 to about 500,000, and an average particle size of less than about 100 nanometers; and

(c) said film of nanomagnetic material has a stress of less than about 500 megaPascals.

3. A magnetically shielded substrate assembly comprised of a substrate and, disposed over such substrate, a magnetic shield, wherein:

(a) said magnetic shield, when exposed to a magnetic field with an intensity of at least 0.5 Teslas, has a magnetic shielding factor of at least about 0.5;

(b) said magnetic shield is comprised of a film of nanomagnetic material comprising at least about 40 weight percent of nanomagnetic material with a mass density of at least about 0.01 grams per cubic centimeter, a saturization magnetization of from about 1 to about 36,000 Gauss, a coercive force of from about 0.01 to about 5,000 Oersteds, a relative magnetic permeability of from about 1 to about 500,000, and an average particle size of less than about 100 nanometers; and

(c) said film of nanomagnetic material has a magnetic anisotropy of less than about 20 degrees.