Open AccessTHEORETICAL AND EXPERIMENTAL STUDY ON COE-RCIVITY MECHANISM OF SINTERED Nd-Fe-B PERMANENT MAGNET ALLOYS
Author(s) -
高汝伟,
Li Hua,
姜寿亭,
章亚明,
周寿增,
李佛标,
张黎东
Publication year - 1994
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.43.145
Subject(s) - coercivity , magnet , nucleation , materials science , demagnetizing field , condensed matter physics , magnetization , field (mathematics) , domain wall (magnetism) , magnetic domain , magnetic field , thermodynamics , physics , mathematics , quantum mechanics , pure mathematics
The coercivity dependence of sintered Nd-Fe-B permanent magnet alloys an orienting magnetic field was studied. The results indicate that demagnetization process of the magnet is basically the nucleation process of anti-magnetization in the soft magnetization regions located at the surface of magnetic grainsand the process in which the nuclei grow into domains and irreversible domain wall displacement takes place from the surface to the inside of grains. We compared the value and the variation dependence of nucleation field with that of depinning field on the orientation of magnetic field. we come to the conclusion that depinning field is the main mech-anism controlling the coercivity of sintered Nd-Fe-B permanent magnet alloys.