Magnetization process in rapidly solidified neodymium-iron-boron permanent magnet materials

Journal Article · Sat Nov 15 00:00:00 EST 1986 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.337576· OSTI ID:5230628

Pinkerton, F E; Van Wingerden, D J

Initial magnetization and demagnetization data are reported for three forms of rapidly solidified Nd-Fe-B permanent magnet materials: melt-spun ribbons, hot-pressed magnets, and die upset magnets. In all three materials, the results are consistent with domain-wall pinning at Nd/sub 2/Fe/sub 14/B grain boundaries as the coercivity mechanism. Thermally demagnetized ribbons are comprised of single domain Nd/sub 2/Fe/sub 14/B grains, and both initial magnetization and demagnetization occur by depinning and wall motion. Domain walls move easily in die upset magnets until they become strongly pinned at grain edges. Complete magnetization requires an applied field greater than the coercive field. Hot-pressed magnets show a mixture of ribbon and die upset behavior.

• Research Organization: Physics Department, General Motors Research Laboratories, Warren, Michigan 48090-9055
• OSTI ID: 5230628
• Journal Information: J. Appl. Phys.; (United States), Vol. 60:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
COERCIVE FORCE
DOMAIN STRUCTURE
MAGNETIZATION
IRON BASE ALLOYS
MAGNETS
FABRICATION
NEODYMIUM ALLOYS
DEMAGNETIZATION
GRAIN BOUNDARIES
HOT PRESSING
ALLOYS
CRYSTAL STRUCTURE
IRON ALLOYS
MATERIALS WORKING
MICROSTRUCTURE
PRESSING
RARE EARTH ALLOYS
360104* - Metals & Alloys- Physical Properties