COMPOSITE MAGNETIC MATERIAL, MAGNET COMPRISING THE MATERIAL, MOTOR USING THE MAGNET, AND METHOD OF MANUFACTURING THE COMPOSITE MAGNETIC MATERIAL
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United States of America Patent
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Issued Date -
Jul 30, 2020
app pub date -
Apr 13, 2020
filing date -
Oct 20, 2017
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Abstract
A composite magnetic material includes a soft magnetic phase including a magnetic material containing a ferromagnetic material including Fe or Co as a main component and a plurality of hard magnetic particles present and dispersed in a form of islands in the soft magnetic phase. The hard magnetic particles have an average particle size of 2 nm or more and include a magnetic material containing a ferrimagnetic material or an antiferromagnetic material as a main component while they are present with an average inter-particle distance of 100 nm or less in the soft magnetic phase. The composite magnetic material has excellent magnetic properties and can be made into a lightweight magnet to be used e.g. in a motor of an aircraft.
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