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Magnetic flux density measurements from narrow grain boundaries produced in sintered permanent magnets
Author(s) -
Youngji Cho,
Su-Jin Lee,
Yasukazu Murakami
Publication year - 2020
Publication title -
microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.545
H-Index - 52
eISSN - 2050-5701
pISSN - 2050-5698
DOI - 10.1093/jmicro/dfaa032
Subject(s) - magnet , grain boundary , materials science , electron holography , condensed matter physics , magnetism , microstructure , foil method , magnetic field , magnetic flux , flux (metallurgy) , metallurgy , composite material , nanotechnology , physics , transmission electron microscopy , quantum mechanics
This review examines methods of magnetic flux density measurements from the narrow grain boundary (GB) regions, the thickness of which is of the order of nanometers, produced in Nd–Fe–B-based sintered magnets. Despite of the complex crystallographic microstructure and the significant stray magnetic field of the sintered magnet, recent progress in electron holography allowed for the determination of the intrinsic magnetic flux density due to the GB which is embedded in the polycrystalline thin-foil. The methods appear to be useful as well for intensive studies about interface magnetism in a variety of systems.

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