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Magnetization, anomalous Barkhausen effect, and core loss of Supermendur under high temperature cycling.The magnetization and core loss of Supermendur were measured up to 900 C under conditions of slow temperature cycling in vacuum. As a consequence of this heating, the coercivity at 25 C increased from 21 A/m to about 110 A/m. This increase is less than previously reported. A prominent anomalous Barkhausen effect, pinched-in hysteresis loops, and a magnetic viscosity field in excess of 20 A/m were observed in the range of 600 to 700 C. At 850 C, Supermendur had a coercivity of 23 A/m, a saturation induction exceeding 1.5 T, a core loss of 26 W/kg at 400 Hz, and a maximum induction of 1.5 T. Supermendur may be useful for high temperature soft magnetic material applications where some history dependence of properties and instability of minor loops at lower temperatures is acceptable.
Document ID
19720032052
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Niedra, J. M.
Schwarze, G. E.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 6, 2013
Publication Date
December 1, 1971
Publication Information
Publication: IEEE Transactions on Magnetics
Volume: MAG-7
Subject Category
Physics, Solid-State
Accession Number
72A15718
Distribution Limits
Public
Copyright
Other

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