Magnetism of ultrathin intergranular boundary regions in Nd–Fe–B permanent magnets

The magnetism of a thin grain-boundary (GB) phase that envelopes the Nd2Fe14B grains in optimally annealed Nd–Fe–B sintered magnets was investigated by electron holography. The phase shift measured from a thin-foil specimen containing a tilted amorphous GB phase (∼3nm in width) was −0.34rad, which i...

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Published in:Acta materialia 2014-06, Vol.71, p.370-379
Main Authors: Murakami, Y., Tanigaki, T., Sasaki, T.T., Takeno, Y., Park, H.S., Matsuda, T., Ohkubo, T., Hono, K., Shindo, D.
Format: Article
Language:English
Subjects:
Applied sciences
Coercivity
Exact sciences and technology
Ferrous alloys
Grain boundary
Grains
Magnetic materials
Magnetism
Magnets
Metals. Metallurgy
Nanostructure
Permanent magnets
Phase shift
Propagation
Sintering
Transmission electron microscopy
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cited_by cdi_FETCH-LOGICAL-c485t-90fa5539c1ab57fa41724794e703550904300f9530f7226f63adafaecd0b71f13
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container_end_page 379
container_issue
container_start_page 370
container_title Acta materialia
container_volume 71
creator Murakami, Y.
Tanigaki, T.
Sasaki, T.T.
Takeno, Y.
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Matsuda, T.
Ohkubo, T.
Hono, K.
Shindo, D.
description The magnetism of a thin grain-boundary (GB) phase that envelopes the Nd2Fe14B grains in optimally annealed Nd–Fe–B sintered magnets was investigated by electron holography. The phase shift measured from a thin-foil specimen containing a tilted amorphous GB phase (∼3nm in width) was −0.34rad, which is substantially smaller than that expected for the nonferromagnetic GB phase of −1.2rad. Simulations of the phase shift with various magnetization values suggest that the magnetic flux density of the GB phase is ∼1.0T. The observations imply significant exchange coupling between Nd2Fe14B grains, which can explain the avalanche propagation of magnetization reversal observed in sintered magnets.
doi_str_mv 10.1016/j.actamat.2014.03.013
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subjects Applied sciences
Coercivity
Exact sciences and technology
Ferrous alloys
Grain boundary
Grains
Magnetic materials
Magnetism
Magnets
Metals. Metallurgy
Nanostructure
Permanent magnets
Phase shift
Propagation
Sintering
Transmission electron microscopy
title Magnetism of ultrathin intergranular boundary regions in Nd–Fe–B permanent magnets
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