23 to 300{degrees}C demagnetization resistance of samarium-cobalt permanent magnets

Technical Report · Tue Oct 01 00:00:00 EDT 1991

DOI:https://doi.org/10.2172/10181004· OSTI ID:10181004

Niedra, J M; Overton, E

The influence of temperature on the knee point and squareness of the M-H demagnetization characteristic of permanent magnets is important information for the full utilization of the capabilities of samarium-cobalt magnets at high temperatures in demagnetization-resistant permanent magnet devices. Composite plots of the knee field and the demagnetizing field required to produce a given magnetic induction swing below remanence were obtained for several commercial Sm{sub 2}Co{sub 17}-type magnet samples in the temperature range of 23 to 300{degrees}C. The knee point was used to define the limits of operation safe against irreversible demagnetization, and the resulting plots are interpreted to show the temperature-induction swing limits of safe magnet operation. The observed second quadrant M-H characteristic squareness is shown, by two measures, to increase gradually with temperature and to peak in the interval 200 to 300{degrees}C.

• Research Organization: NASA Lewis Research Center, Cleveland, OH (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
• DOE Contract Number: AI03-86SF16310
• OSTI ID: 10181004
• Report Number(s): NASA-TP-3119; ON: DE94051194; TRN: 94:008267
• Resource Relation: Other Information: PBD: Oct 1991
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
PERMANENT MAGNETS
DEMAGNETIZATION
TEMPERATURE DEPENDENCE
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MAGNETIC MATERIALS
STIRLING ENGINES
NESDPS Office of Nuclear Energy Space and Defense Power Systems
210600
360104
POWER REACTORS, MOBILE, PROPULSION, PACKAGE, AND TRANSPORTABLE
PHYSICAL PROPERTIES