Quench rate dependence of the initial magnetization in rapidly solidified neodymium-iron-boron ribbons

Journal Article · Mon Sep 01 04:00:00 EDT 1986 · IEEE Trans. Magn.; (United States)

DOI:https://doi.org/10.1109/TMAG.1986.1064528· OSTI ID:6969516

Pinkerton, F E

The quench rate dependence of the magnetization process is reported for rapidly solidified Nd-Fe-B ribbons. In optimally quenched ribbons, where the Nd/sub 2/Fe/sub 14/B grain size is less than the estimated single domain particle size, moment reversal during both magnetization and demagnetization is controlled by strong domain wall pinning at grain boundaries. Maximum coercivity is accompanied by a low initial permeability. Coercivity is reduced in overquenched ribbons by partial retention of a magnetically soft amorphous or very finely crystalline microstructure. Coercivity decreases in underquenched ribbons because wall pinning wakens as the grain size increases above optimum. Magnetization and demagnetization behaviors remain strongly correlated in underquenched ribbons, suggesting that maximum coercivity may be largely determined by the resistance to domain wall formation within grains smaller than the single domain particle limit.

• Research Organization: Physics Dept., General Motors Research Labs., Warren, MI 48090-9055
• OSTI ID: 6969516
• Journal Information: IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. MAG-22:5; ISSN IEMGA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
BORON ALLOYS
CRYSTAL STRUCTURE
DEMAGNETIZATION
GRAIN BOUNDARIES
GRAIN SIZE
IRON ALLOYS
IRON BASE ALLOYS
MAGNETIZATION
MICROSTRUCTURE
NEODYMIUM ALLOYS
OPTIMIZATION
PARTICLE SIZE
PERMEABILITY
PHASE TRANSFORMATIONS
QUENCHING
RARE EARTH ALLOYS
SIZE
SOLIDIFICATION