Fourier analysis of digital hysteresis data: rock magnetic applications

Mike Jackson, Horst Ulrich Worm, Subir K. Banerjee

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

The approach to saturation of a ferromagnetic material can be characterized in terms of the frequency content of its hysteresis loop. This is done by 'unfolding' the loop into a pseudo-waveform, which is then analyzed using standard Fourier methods. In experiments on samples with discrete grain sizes of magnetite, the decay of Fourier component amplitude as a function of harmonic degree is sensitive to grain size (which controls the 'squareness' of the loop). For samples containing a mixture of magnetite grain sizes, and for samples containing a mixture of magnetite and hematite, the phase shift as a function of harmonic degree is a sensitive indicator of the distribution of coercivities (which controls the asymmetry of the unfolded waveform).

Original languageEnglish (US)
Pages (from-to)78-87
Number of pages10
JournalPhysics of the Earth and Planetary Interiors
Volume65
Issue number1-2
DOIs
StatePublished - 1990

Bibliographical note

Funding Information:
Automation and interfacing of the VSM used in this study was made possible by NSF grant EAR-8618869, matching support from the University of Minnesota, and by the ingenuity and perseverence of Jim Marvin. We thank D.J. Dunlop, Song Xu, and two anonymous referees for their helpful comments on the original draft of this paper.

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