skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The effect of pinning and nucleation field distributions on reversible magnetization behavior

Abstract

A model has been developed to examine the effect that different distributions of pinning and nucleation fields have upon the reversible magnetization behavior. The model allows each grain to be in one of three states, saturated in the positive and negative directions or containing a domain wall. The nucleation and pinning field distributions determine the rate of change of the number of grains in the three states with field. The results indicate that reversible magnetization curves display a well-defined minimum where the domain wall pinning fields exceed the reverse domain nucleation fields. Where the domain wall nucleation fields exceed the domain wall pinning fields no minimum is seen. The exact shape of the reversible magnetization curve and the position of the minimum are indicative of the dynamics of the reversal process. This model is able to reproduce the form of reversible magnetization curves measured previously in a sintered isotropic NdFeB based magnet and a Sm{sub 2}(Co, Fe, Cu, Zr){sub 17} type magnet. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1]
  1. Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973 (United States)
Publication Date:
OSTI Identifier:
20216212
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNETIZATION; SAMARIUM ALLOYS; COBALT ALLOYS; IRON ALLOYS; COPPER ALLOYS; ZIRCONIUM ALLOYS; DOMAIN STRUCTURE; GRAIN BOUNDARIES; NEODYMIUM ALLOYS; BORON ALLOYS; PERMANENT MAGNETS; THEORETICAL DATA

Citation Formats

Crew, D. C., and Lewis, L. H. The effect of pinning and nucleation field distributions on reversible magnetization behavior. United States: N. p., 2000. Web. doi:10.1063/1.373158.
Crew, D. C., & Lewis, L. H. The effect of pinning and nucleation field distributions on reversible magnetization behavior. United States. doi:10.1063/1.373158.
Crew, D. C., and Lewis, L. H. Mon . "The effect of pinning and nucleation field distributions on reversible magnetization behavior". United States. doi:10.1063/1.373158.
@article{osti_20216212,
title = {The effect of pinning and nucleation field distributions on reversible magnetization behavior},
author = {Crew, D. C. and Lewis, L. H.},
abstractNote = {A model has been developed to examine the effect that different distributions of pinning and nucleation fields have upon the reversible magnetization behavior. The model allows each grain to be in one of three states, saturated in the positive and negative directions or containing a domain wall. The nucleation and pinning field distributions determine the rate of change of the number of grains in the three states with field. The results indicate that reversible magnetization curves display a well-defined minimum where the domain wall pinning fields exceed the reverse domain nucleation fields. Where the domain wall nucleation fields exceed the domain wall pinning fields no minimum is seen. The exact shape of the reversible magnetization curve and the position of the minimum are indicative of the dynamics of the reversal process. This model is able to reproduce the form of reversible magnetization curves measured previously in a sintered isotropic NdFeB based magnet and a Sm{sub 2}(Co, Fe, Cu, Zr){sub 17} type magnet. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373158},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}