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US 9,067,833 B2Granted
Iron oxide and silica magnetic core
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorMichael Paul Rowe
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Abstract
A magnetic core of superparamagnetic core shell nanoparticles having a particle size of less than 50 nm; wherein the core is an iron oxide and the shell is a silicon oxide is provided. The magnetic core is a monolithic structure of superparamagnetic core grains of iron oxide directly bonded by the silicon dioxide shells. A method to prepare the magnetic core which allows maintenance of the superparamagnetic state of the nanoparticles is also provided. The magnetic core has little core loss due to hysteresis or eddy current flow.
Claims9
A magnetic core, comprising:
- a monolithic structure of a plurality of superparamagnetic nanoparticle grains of iron oxide in a silica matrix;
- wherein
- a space between individual superparamagnetic nano iron oxide grains is occupied substantially only by the silica matrix, and
- the magnetic core is obtained by compaction and sintering of a plurality of superparamagnetic core shell nanoparticles having a core of iron oxide, a shell of a silicon oxide and a particle size of less than 50 nm.
1 more element
Dependencies are inferred from the claim text.