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Title: The effect of temperature on the magnetization reversal mechanism in sintered PrFeB

Abstract

To understand the effects of nucleation fields and intergranular dipolar interactions on the magnetization reversal mechanism, recoil curves from the major hysteresis loop have been measured on a sample of sintered PrFeB as a function of temperature from 150 to 300 K. At room temperature the reversible magnetization behavior indicates a reversal mechanism of nucleation of domain walls whose motion after nucleation is resisted by dipolar fields. As the temperature is reduced, the coercivity, and hence the nucleation field, is observed to increase while the dipolar fields, dependent on microstructure and saturation magnetization, remain approximately constant. These temperature-dependent changes in the relative magnitudes of the dipolar field and nucleation field cause the reversible magnetization behavior to change from domain wall motion to rotation. This change in behavior is attributed to the supposition that at temperatures where the nucleation field exceeds the dipolar field, once nucleated, domain walls are swept out of the material. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [2]
  1. Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  2. Carnegie Mellon Research Institute, 700 Technology Drive, P.O. Box 2950, Pittsburgh, Pennsylvania 15230 (United States)
Publication Date:
OSTI Identifier:
20216207
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; PRASEODYMIUM ALLOYS; IRON ALLOYS; BORON ALLOYS; MAGNETIZATION; HYSTERESIS; PERMANENT MAGNETS; DOMAIN STRUCTURE; NUCLEATION; TEMPERATURE DEPENDENCE; EXPERIMENTAL DATA

Citation Formats

Crew, D. C., Lewis, L. H., Welch, D. O., and Pourarian, F. The effect of temperature on the magnetization reversal mechanism in sintered PrFeB. United States: N. p., 2000. Web. doi:10.1063/1.373145.
Crew, D. C., Lewis, L. H., Welch, D. O., & Pourarian, F. The effect of temperature on the magnetization reversal mechanism in sintered PrFeB. United States. doi:10.1063/1.373145.
Crew, D. C., Lewis, L. H., Welch, D. O., and Pourarian, F. Mon . "The effect of temperature on the magnetization reversal mechanism in sintered PrFeB". United States. doi:10.1063/1.373145.
@article{osti_20216207,
title = {The effect of temperature on the magnetization reversal mechanism in sintered PrFeB},
author = {Crew, D. C. and Lewis, L. H. and Welch, D. O. and Pourarian, F.},
abstractNote = {To understand the effects of nucleation fields and intergranular dipolar interactions on the magnetization reversal mechanism, recoil curves from the major hysteresis loop have been measured on a sample of sintered PrFeB as a function of temperature from 150 to 300 K. At room temperature the reversible magnetization behavior indicates a reversal mechanism of nucleation of domain walls whose motion after nucleation is resisted by dipolar fields. As the temperature is reduced, the coercivity, and hence the nucleation field, is observed to increase while the dipolar fields, dependent on microstructure and saturation magnetization, remain approximately constant. These temperature-dependent changes in the relative magnitudes of the dipolar field and nucleation field cause the reversible magnetization behavior to change from domain wall motion to rotation. This change in behavior is attributed to the supposition that at temperatures where the nucleation field exceeds the dipolar field, once nucleated, domain walls are swept out of the material. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373145},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}