Abstract

In a large part of the hysteresis cycle of a ferromagnetic material, the magnetization process takes place through a random sequence of discontinuous movements of magnetic domain walls, giving rise to what is termed magnetic Barkhausen noise (MBN). This noise phenomenon can give information on the interaction between domain walls and stress configurations, or compositional microstructure. It is also a complementary nondestructive testing technique to eddy-current probe sensors as well as magnetic flux leakage (MFL), both established in the nondestructive evaluation industry.This chapter takes a closer look at the influence of stress on magnetic domain configuration, and how this is reflected in the MBN signal. The latter can be analyzed by using a variety of parameters, and some of these are introduced during the discussion. Apart from domain configuration, stress also affects magnetic anisotropy which can reveal further details on the stress state present in the material. Concurrently, residual stresses and dislocations play a significant role in the MBN investigation, completing the analysis and adding to the competitiveness of MBN as a nondestructive testing technique for ferromagnetic materials.KeywordsResidual StressDomain WallMagnetic AnisotropyMagnetic DomainFerromagnetic MaterialThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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