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US 9,427,805 B2Granted
Method to prepare hard-soft magnetic FeCo/ SiO2/MnBi nanoparticles with magnetically induced morphology
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsMichael Paul Rowe, Ryan Daniel Desautels
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Abstract
A method to prepare a core-shell-shell FeCo/SiO2/MnBi nanoparticle wherein the morphology of the MnBi shell is formed by synthesis of the MnBi layer in an applied magnetic field is provided.
Claims8
A method to prepare a core-shell-shell FeCo/SiO2/MnBi nanoparticle, comprising:
- a) co-reducing an iron ion and a cobalt ion from a common solution;
- and coprecipitating an FeCo alloy nanoparticle;
- isolating the FeCo nanoparticle from the reduction mixture;
- b) forming a silica coating on the FeCo nanoparticle to obtain a core-shell nanoparticle;
- and
- c) forming a MnBi alloy nanocoating on the core-shell nanoparticle by reduction of Bi ions by a Mn borohydride complex with precipitation from a solution as a MnBi alloy onto the silica shell;
- wherein the formation of the MnBi alloy nanocoating c) is conducted within a magnetic field of from 50 to 800 Gauss.
4 more elements
Dependencies are inferred from the claim text.