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THEORETICAL AND EXPERIMENTAL STUDY ON COE-RCIVITY MECHANISM OF SINTERED Nd-Fe-B PERMANENT MAGNET ALLOYS

ZHOU SHOU-ZENG LI FO-BIAO ZHANG LI-DONG GAO RU-WEI LI HUA JIANG SHOU-TING ZHANG YA-MING

THEORETICAL AND EXPERIMENTAL STUDY ON COE-RCIVITY MECHANISM OF SINTERED Nd-Fe-B PERMANENT MAGNET ALLOYS

ZHOU SHOU-ZENG, LI FO-BIAO, ZHANG LI-DONG, GAO RU-WEI, LI HUA, JIANG SHOU-TING, ZHANG YA-MING
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  • Received Date:  24 March 1993
  • Published Online:  20 January 1994

THEORETICAL AND EXPERIMENTAL STUDY ON COE-RCIVITY MECHANISM OF SINTERED Nd-Fe-B PERMANENT MAGNET ALLOYS

  • 1. (1)北京科技大学材料系; (2)山东大学物理系

Abstract: 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 grains,and 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.

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