Applied magnetic field synthesis and processing of iron nitride magnetic materials
AssigneeRegents of the University of Minnesota
InventorsMichael P. Brady, Orlando Rios, YanFeng Jiang, Gerard M. Ludtka, Craig A. Bridges, Jian-Ping Wang, Xiaowei Zhang, Lawrence F. Allard, Edgar Lara-Curzio
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Abstract
A method may include annealing a material including iron and nitrogen in the presence of an applied magnetic field to form at least one Fe16N2 phase domain. The applied magnetic field may have a strength of at least about 0.2 Tesla (T).
Claims34
A method comprising:
- solutionizing a material including iron, nitrogen, and at least one dopant, in the presence of an applied magnetic field with a strength of at least about 0.2 T at a temperature of about 660° C. or more;
- and
- after solutionizing the material, quenching the material;
- annealing the material to form an iron nitride material with at least one Fe16N2 phase domain, wherein the applied magnetic field has a strength of at least about 0.2 Tesla (T), wherein the at least one dopant comprises at least one of Al, Mn, La, Cr, Co, Ti, Ni, or a rare earth metal.
A method comprising:
- nitridizing a material including iron in the presence of an applied magnetic field to form an iron-nitride-containing material at a temperature of about 600° C. or more;
- and annealing the iron-nitride-containing material in the presence of the applied magnetic field to form at least one Fe16N2 phase domain, wherein the applied magnetic field has a strength of at least about 0.2 Tesla (T), wherein the iron-nitride-containing material comprises at least one dopant selected from Al, Mn, La, Cr, Co, Ti, Ni, or a rare earth metal in the iron nitride material.
A workpiece comprising iron nitride material made by solutionizing a material including iron and nitrogen at a temperature of about 600° C. or more, and annealing the material in the presence of an applied magnetic field to form at least one Fe16N2 phase domain, wherein the applied magnetic field has a strength of at least about 0.2 Tesla (T), wherein the iron and nitrogen containing material comprises at least one dopant selected from Al, Mn, La, Cr, Co, Ti, Ni, or a rare earth metal in the iron nitride material.
Dependencies are inferred from the claim text.