Magnetization reversal in melt-quenched NdFeB Metadata

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Title

  • Main Title Magnetization reversal in melt-quenched NdFeB

Creator

  • Author: Crew, D.C.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy. Office of Energy Research.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Energy Research (ER) (United States)

Publisher

  • Name: Brookhaven National Laboratory
    Place of Publication: Upton, New York
    Additional Info: Brookhaven National Lab., Upton, NY (United States)

Date

  • Creation: 1999-04-05

Language

  • English

Description

  • Content Description: Melt-quenched NdFeB is an important modern permanent magnet material. However, there still remains doubt as to the magnetization reversal mechanism which controls coercivity in material prepared by this processing route. To investigate this problem a new technique based on measurements of reversible magnetization along recoil curves has been used. The technique identifies the presence of free domain walls during magnetic reversal. For this study samples of isotropic (MQI), hot pressed (MQII) and die upset (MQIII) melt-quenched NdFeB were examined. The results indicate that in MQI free domain walls are not present during reversal and the reversal mechanism is most likely incoherent rotation of some form. Free domain walls are also not present during reversal in the majority of grains of MQII, even though initial magnetization measurements indicate that the grain size is large enough to support them. In MQIII free domain walls are present during reversal. These results are attributed to the reduced domain wall nucleation field in MQIII compared with MQII and the increased dipolar interactions in MQIII.
  • Physical Description: 6 pages

Subject

  • Keyword: Magnetization
  • STI Subject Categories: 36 Materials Science
  • Keyword: Neodymium Alloys
  • Keyword: Domain Structure
  • Keyword: Permanent Magnets
  • Keyword: Magnetic Materials
  • Keyword: Fabrication
  • Keyword: Coercive Force
  • Keyword: Iron Alloys
  • Keyword: Boron Alloys

Source

  • Conference: Materials Research Society Spring Meeting, San Francisco, CA (US), 04/05/1999--04/09/1999

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: BNL--66051
  • Report No.: KC0202020
  • Grant Number: AC02-98CH10886
  • DOI: 10.2172/350917
  • Office of Scientific & Technical Information Report Number: 752925
  • Archival Resource Key: ark:/67531/metadc709995
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