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US 12,362,082 B2Granted
Coercivity-enhanced iron nitride nanoparticles with high saturation magnetization
AssigneeNiron Magnetics, Inc.
InventorsFrancis Johnson, Yiming Wu, John Michael Larson, L. Anderson Blackburn
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Abstract
Iron nitride nanoparticles and magnet materials made from iron nitride nanoparticles are described. The iron nitride nanoparticles have a core and a shell morphology. The shell is configured to provide a means to nitride the core. The magnetic materials are characterized as having an Msat greater than about 160 emu/g and a coercivity greater than about 700 Oe.
Claims14
A plurality of iron-nitride nanoparticles, comprising:
- a. an iron-based core, the iron-based core comprising 50% or more of α″-Fe16N2 phase in weight;
- and
- b. a thin material adjacently disposed on the iron-based core, wherein the thin material has an average thickness of 1 to 5 nm, wherein the thin material is characterized as a ductile metal;
- wherein the nanoparticles are characterized with X-Ray diffraction using an X-Ray source with a Cu target configured to emit monochromatic Cu-Kα X-rays, the X-Ray diffraction giving rise to diffraction peaks wherein the ratio of the integrated intensity of the α-Fe (211) peak (at about 82.2 °2Θ) to the α″-Fe16N2 (202) peak (at about 42.7 °2Θ) is 0.2 or less;
- wherein the nanoparticles are characterized as having a saturation magnetization value (Msat) greater than about 145 emu/g.
2 more elements
A magnetic material, comprising:
- a. a plurality of iron-nitride nanophases characterized as comprising 50% or more of α″-Fe16N2 phase based on weight of the magnetic material, and b. ductile metal disposed between the nanophases, wherein the ductile metal has an average thickness of 1 to 5 nm;
- wherein the magnetic material is characterized with X-Ray diffraction using an X-Ray source with a Cu target configured to emit monochromatic Cu-Kα X-rays, the X-Ray diffraction giving rise to diffraction peaks wherein the ratio of the integrated intensity of the α-Fe (211) peak (at about 82.2 °2Θ) to the α″-Fe16N2 (202) peak (at about 42.7 °2Θ) is 0.2 or less;
- wherein the magnetic material is characterized as having a saturation magnetization value (Msat) greater than about 145 emu/g.
Dependencies are inferred from the claim text.