Document Type
Article
Publication Date
2014
Journal or Book Title
Journal of Applied Physics
Volume
115
Issue
17
First Page
17E305
DOI
10.1063/1.4862095
Abstract
In this study, we conceptually divided a ferromagnetic specimen into layers along its depth. For each layer, we derived a non-linear integral equation that describes the attenuation with frequency and distance of magnetic Barkhausen emissions coming from that layer. We postulate that the Barkhausen spectrum measured at the surface by an induction coil can be expressed as the sum of the individual layer spectra. We show how a non-linear least squares algorithm can be used to recover the properties in individual layers. These are related to stress using an extension to the theory of ferromagnetic hysteresis. We found that the quality of the fit is influenced by the sensitivity of the ferromagnetic material to strain, as well as by the sensor-specimen coupling. The proposed method can be used for the non-destructive characterization of stress as a function of depth in magnetic materials.
Copyright Owner
American Institute of Physics
Copyright Date
2014
Language
en
Recommended Citation
Kypris, Orfeas; Nlebedim, I. C.; and Jiles, David C., "Barkhausen spectroscopy: Non-destructive characterization of magnetic materials as a function of depth" (2014). Electrical and Computer Engineering Publications. 14.
https://lib.dr.iastate.edu/ece_pubs/14
Comments
The following article appeared in Journal of Applied Physics 115 (2014): 17E305 and may be found at http://dx.doi.org/10.1063/1.4862095.