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HIGH-TEMPERATURE AC MAGNETIC PROPERTIES OF NANOCRYSTALINE FINEMET ALLOYS WITH Co ADDITION
Author(s): Y.H. Ding, X. Liu, S.S. Zhao, Y. Long, R.C. Ye, Y.Q. Chang, F.R. Wan
Pages: 327-
333
Year: 2007
Issue:
5
Journal: ACTA METALLURGICA SINICA(ENGLISH LETTERS)
Keyword: high temperature; nanocrystalline; permeability spectra;
Abstract: High-temperature AC magnetic properties for (Fe0.5Co0.5)73.5Cu1Nb3Si13.5B9 alloy annealed at various temperatures have been investigated using an impedance analyzer. Annealing temperature Ta has obvious effects on high-temperature AC magnetic properties of the alloy. The Hopkinson peak appears only in the amorphous alloy when Ta ≤ 703K. As Ta increases above 733K, the real part of the complex initial permeability μi' descends gradually, μi' decreases more slowly with temperature in the high temperature range. The high-temperature (about 750K) AC initial permeability for the alloy annealed at Ta=763K has been found to maintain a stable high value of 950 up toa frequency of~ 1 × 105Hz Partial substitution of Co for Fe in the Fe73.5Cu1Nb3Si13.5B9 alloy leads to an increase of around 110K of the Curie temperature of the amorphous phase, much higher than Ge-containing Finemet alloy.
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