Superior magnetic softness at elevated temperature of Si-rich Fe-based nanocrystalline alloy

An excellent high-temperature magnetic softness was observed in a Si-rich nanocrystalline Fe74.5Cu1Nb2Si17.5B5 alloy. The Curie temperatures of amorphous and crystal phases, TCA* and TCcry, for this alloy were detected to be 365 °C and 580 °C, respectively. For the 480 °C-annealed alloy, the initial...

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Veröffentlicht in:Journal of applied physics 2012-10, Vol.112 (8)
Hauptverfasser: Shi, Rui-min, Wang, Zhi, Jia, Yun-yun, Wen, Zhuan-ping, Wang, Bo-wen, Zhang, Tao
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Sprache:eng
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Zusammenfassung:An excellent high-temperature magnetic softness was observed in a Si-rich nanocrystalline Fe74.5Cu1Nb2Si17.5B5 alloy. The Curie temperatures of amorphous and crystal phases, TCA* and TCcry, for this alloy were detected to be 365 °C and 580 °C, respectively. For the 480 °C-annealed alloy, the initial permeability μi drops to nearly zero just above TCA*; however, for the 540 °C-annealed alloy, the μi of about 10 000 at f = 10 kHz has no perceivable decline in this temperature range and can hold up to more than 400 °C. Such a magnetic softness at elevated temperature is superior to that of Finemet-type Fe-based nanocrystalline alloys ever reported. The origin of the high temperature magnetic softness was interpreted by the enhancement effect of Curie temperature in residual amorphous matrix.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4759243