Investigation of the Behavior of High-Anisotropy Permanent Magnet Materials.
Abstract
This report describes investigations related to the origin of the magnetic coercive force in high-anisotropy materials that have taken place over a three-year period of contract support. Such materials with sufficiently high saturation magnetization supply the basis for the development of permanent magnets superior to anything currently available. A microsample technique developed in this work has made it possible to show for the first time that conventionally sintered bulk Co5Sm samples have magnetic properties that are defect-dominated in the same way as in particles, and show many magnetization phenomena previously seen only in single particles prepared from cast material. New measuring techniques were developed to make such observations possible. The potentially superior copper-modified alloys have been found to be dominated by domain wall pinning, in complete contrast to Co5Sm, as shown by hysteresis loop analysis techniques that have been developed. Materials have been investigated in which both types of coercive force mechanisms coexist in the same sample and can be independently influenced. The distinction between nucleation and pinning domination is crucial to future alloy development as the desired structures are totally different. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1977
- Accession Number
- ADA041142
Entities
People
- J. J. Becker
Organizations
- General Electric