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ASM Handbook

Nondestructive Evaluation of Materials

Edited by
Aquil Ahmad
Aquil Ahmad
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Leonard J. Bond
Leonard J. Bond
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ASM International
Volume
17
ISBN electronic:
978-1-62708-190-0
Publication date:
2018
Book Chapter

Micromagnetic Techniques

By
Thomas W. Krause
Thomas W. Krause
Royal Military College of Canada
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Arash Samimi
Arash Samimi
Queen's University
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Published:
2018
Page range:
515 - 530
Publication history
August 21, 2018

Abstract

This article discusses the principles and limitations of micromagnetic techniques, namely, magnetic Barkhausen noise (MBN) and magnetoacoustic emission (MAE). It also discusses various factors limiting the establishment of acceptance criteria for test components as they pertain to the successful application of MBN measurement and signal interpretation. The article provides an overview of basic magnetic phenomena and dynamics in ferromagnetic materials that underlie the origin of MBN emissions. It describes the changes in the domain structure of the ferromagnetic material under an applied external field. The relationship between uniaxial stress and angular-dependent strain is also discussed. The influence of stress on domain walls, and therefore, the generation of Barkhausen noise are described. The article also describes the directional and angular MBN measurements and provides information on detection, angular dependence, and advanced analysis methods of MBN emissions.

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Thomas W. Krause, Arash Samimi, 2018. "Micromagnetic Techniques", Nondestructive Evaluation of Materials, Aquil Ahmad, Leonard J. Bond

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