Nanomagnetically shielded substrate

• US 6,864,418 B2
• Filed: 12/18/2002
• Issued: 03/08/2005
• Est. Priority Date: 12/18/2002
• Status: Expired due to Fees

• Current Assignee: Biophan Technologies Incorporated
• Original Assignee: Nanoset LLC
• Inventors: Wang, Xingwu, Greenwald, Howard J.
• Primary Examiner(s): Ngo, Hung V.
• Application Number:
  US10/324,773
• Publication Number:
  US 20040256131A1
• Time in Patent Office: 811 Days
• Field of Search: 174/35.R, 174/35.MS, 428/217, 428/218, 428/323, 428/402, 361/816, 361/818
• 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 shielded substrate assembly that contains a magnetic shield with a layer of magnetic shielding material; the magnetic shield has a magnetic shielding factor of at least about 0.5. The magnetic shield contains nanomagnetic material nanomagnetic material with a mass density of at least about 0.01 grams per cubic centimeter, a saturation 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. The nanomagnetic material contains magnetic material with a coherence length of from about 0.1 to about 100 nanometers.

Claims

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

(a) said magnetic shield is comprised a layer of magnetic shielding material,

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

(c) said layer of magnetic shielding material is comprised of at least about 40 weight percent of nanomagnetic material with a mass density of at least about 0.01 grams per cubic centimeter, a saturation 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,

(d) said nanomagnetic material is comprised of at least about 1 mole percent of a magnetic material with a relative magnetic permeability of from about 1 to about 500,000 a saturization magnetization of from about 1 to about 36,000 Gauss, and a a coercive force of from about 0.01 to about 5,000 Oersteds,

(e) the coherence length (L) of said magnetic material is from about 0.1 to about 100 nanometers, and the normalized magnetic interaction (M) of said magnetic material is from about 3×

10<sup>−

4</sup> to about 1.0, wherein M=exp<sup>−

x/L</sup>, wherein exp is equal to 2.71828, wherein x is the spacing between adjacent moieties of said magnetic material within said nanomagnetic material, and wherein x is from about L×

10<sup>−

5</sup> to about L×

10².

2. The shielded substrate assembly as recited in claim 1, wherein said shielded substrate assembly has a springback angle of less than about 45 degrees.

3. The shielded substrate assembly as recited in claim 1, wherein said shielded substrate assembly has a springback angle of less than about 10 degrees.

4. The shielded substrate assembly as recited in claim 1, wherein said nanomagnetic material is comprised of at least about 10 weight percent of said magnetic material.

5. The shielded substrate as recited in claim 1, wherein, in addition to said magnetic material, said nanomagnetic material is also comprised of nonmagnetic material with a relative magnetic permeability of 1.0.

6. The shielded substrate as recited in claim 5, wherein said magnetic material is comprised of atoms selected from the group consisting of iron, nickel, and cobalt.

7. The shielded substrate as recited in claim 5, wherein, in addition to said magnetic material and said nonmagnetic material, said nanomagnetic material is material selected from the group consisting of elemental oxygen, elemental nitrogen, elemental fluorine, elemental chlorine, elemental hydrogen, elemental helium, elemental neon, elemental argon, elemental krypton, and elemental xenon.

8. The shielded substrate assembly as recited in claim 1, wherein said substrate is a conductor.

9. The shielded substrate assembly as recited in claim 8, wherein said magnetic shield is contiguous with said conductor.

10. The shielded substrate assembly as recited in claim 1, wherein said wherein said magnetic shield is comprised of an exterior surface with a Moh'"'"'s hardness of from about 5 to about 15.

11. The shielded magnetic assembly as recited in claim 1, wherein said magnetic shield is comprised of sheath disposed around said layer of magnetic shielding material.

12. The shielded magnetic assembly as recited in claim 1, wherein said magnetic shield is comprised of a material with a dielectric constant of from about 1.1 to about 10.

13. The shielded magnetic assembly as recited in claim 1, wherein said magnetic shield is comprised of diamond-like carbon.

14. The shielded magnetic assembly as recited in claim 1, wherein wherein said magnetic shield has a thickness of from about 100 nanometers to about 10 microns.

15. The shielded magnetic assembly as recited in claim 1, wherein said layer of magnetic shielding material, when exposed to a magnetic field with an intensity of at lest about 0.5 Tesla, has a magnetic shielding factor of at least about 0.9.

16. The shielded magnetic assembly as recited in claim 1, wherein said magnetic shield is comprised of an exterior surface that is hydrophobic.

17. The shielded magnetic assembly as recited in claim 1, wherein said magnetic shield is comprised of an exterior surface that is hydrophilic.

18. The shielded magnetic assembly as recited in claim 1, wherein said layer of magnetic shielding material is comprised of at least 50 weight percent of said nanomagnetic material.