B-H loops modified by superposing ac magnetic fields

Der-Ray Huang*, James C.M. Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The B-H loops of ferromagnetic amorphous alloys can be modified with the apparent coercivity reduced by superposing a suitable ac magnetic field. For as-cast Fe78B13Si9 (Allied 2605S2) with the superposed field, the width of the dc B-H loops could be reduced to a third of the dc value without the ac field. For dc or low-frequency B-H loops, it seems that an ac magnetic field of proper frequency and magnitude can vibrate the domain walls sufficiently so that a small additional field can move them. When the frequency for B-H loop measurement was higher than 10 Hz, the effect of superposing an ac magnetic field appeared to be just the superposition of the two applied fields.

Original languageEnglish
Pages (from-to)4922-4924
Number of pages3
JournalJournal of Applied Physics
Issue number8
StatePublished - 1 Dec 1991

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