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Title: Magnetism in grain-boundary phase of a NdFeB sintered magnet studied by spin-polarized scanning electron microscopy

The magnetism in the grain-boundary phase of a NdFeB sintered magnet was measured by spin-polarized scanning electron microscopy (spin SEM). A sample magnet was fractured in the ultra-high-vacuum chamber to avoid oxidation, and its magnetizations in the exposed grain-boundary phase on the fracture surface were evaluated through the spin polarization of secondary electrons. Spin-SEM images were taken as the fracture surface was milled gradually by argon ions, and the magnetization in the grain-boundary phase was quantitatively obtained separately from that of the Nd{sub 2}Fe{sub 14}B phase. The obtained magnetization shows that the grain-boundary phase of this magnet has substantial magnetization, which was confirmed to be ferromagnetic.
Authors:
;  [1] ; ;  [2]
  1. Central Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-0395 (Japan)
  2. Magnetic Materials Research Laboratory, Hitachi Metals Ltd., Osaka 618-0013 (Japan)
Publication Date:
OSTI Identifier:
22299993
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BORON ALLOYS; GRAIN BOUNDARIES; IMAGES; IRON ALLOYS; MAGNETISM; MAGNETIZATION; MAGNETS; NEODYMIUM ALLOYS; OXIDATION; SCANNING ELECTRON MICROSCOPY; SPIN; SPIN ORIENTATION; SURFACES