US 6,162,532 A · Magnetic storage medium formed of nanoparticles

Abstract

A magnetic storage medium is disclosed which is formed from a layer of substantially uniformly spaced-apart magnetic nanoparticles of substantially uniform diameter disposed upon a surface of a substrate, with a coating, preferably of abrasion-resistant material, applied to adhere the nanoparticles to the substrate and to maintain their substantially uniform spaced-apart relationship. The nanoparticles are formed from a magnetic material selected from the group consisting of elements Co, Fe, Ni, Mn, Sm, Nd, Pr, Pt, Gd, an intermetallic compound of the aforesaid elements, a binary alloy of said elements, a ternary alloy of said elements, an oxide of Fe further comprising at least one of said elements other than Fe, barium ferrite, and strontium ferrite.

Claims20

Dependent claims

A magnetic storage medium comprising:

a) a substrate having a surface,
b) a layer of particles disposed in a substantially uniformly spaced-apart relationship upon said surface, said particles having a substantially uniform diameter not exceeding 50 nanometers, said particles comprising a magnetic material selected from the group consisting of elements Co, Fe, Ni, Mn, Sm, Nd, Pr, Pt, Gd, an intermetallic compound of the aforesaid elements, a binary alloy of said elements, a ternary alloy of said elements, an oxide of Fe further comprising at least one of said elements other than Fe, barium ferrite, and strontium ferrite,
c) a coating surrounding said particles and adhering to said surface to maintain said substantially equally spaced-apart relationship, and
d) an affinity layer disposed between said layer of particles and in a selected pattern over at least part of said surface of said substrate.

1 more element

A method of forming a magnetic storage medium upon a surface of a substrate comprising:

a) preparing a liquid dispersion, in a solvent, of magnetic particles coated with an organic stabilizer material, said magnetic particles having a substantially uniform diameter not exceeding 50 nanometers, said particles comprising a magnetic material selected from the group consisting of elements Co, Fe, Ni, Mn, Sm, Nd, Pr, Pt, Gd, an intermetallic compound of the aforesaid elements, a binary alloy of said elements, a ternary alloy of said elements, an oxide of Fe further comprising at least one of said elements other than Fe, barium ferrite, and strontium ferrite,
b) applying said liquid dispersion to said surface of said substrate, and
c) evaporating said solvent to thereby form, upon said surface of said substrate, a layer of said magnetic particles coated with said organic stabilizer material, said magnetic particles being maintained in a substantially uniformly spaced-apart relationship upon said surface by said organic stabilizer material.

Dependencies are inferred from the claim text.

Magnetic storage medium formed of nanoparticles

Life of this patent

Magnetic storage medium formed of nanoparticles

Life of this patent

Abstract

Claims20