Extraordinary eddy-current anomaly in nanocrystalline FeCuNbSiB wires under circular ac magnetization

D. X. Chen

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Abstract

The circular ac susceptibility of nanocrystalline FeCuNbSiB wire devitrified from its amorphous precursor by tension-current annealing is determined from ac impedance measurements. The results are shown to be well fitted by an eddy-current model of bamboo-domain wall displacements, but the frequency scale of the modeling curves has to be divided by a number 1. In contrast to the well-known eddy-current anomaly resulting from the existence of large domains, this eddy-current anomaly is extraordinary and originates from the presence of dispersed micromagnetic reversal regions within each domain, which exposes a remarkable feature of the magnetic structure of nanocrystalline materials. © 2006 American Institute of Physics.
Original languageEnglish
Article number172505
JournalApplied Physics Letters
Volume88
Issue number17
DOIs
Publication statusPublished - 15 May 2006

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