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On the role of crystal and stress anisotropy in magnetic Barkhausen noise

: Sheikh Amiri, Meisam; Thielen, Matthias; Rabung, Madalina; Marx, Michael; Szielasko, Klaus; Boller, Christian

Postprint urn:nbn:de:0011-n-3035000 (1.3 MByte PDF)
MD5 Fingerprint: d0ebc1e7fe2e3b9a496fcdc8b6be4c61
Created on: 19.8.2014

Journal of magnetism and magnetic materials 372 (2014), pp.16-22
ISSN: 0304-8853
Journal Article, Electronic Publication
Fraunhofer IZFP ()
applied and residual stress; Barkhausen noise; magnetic force microscopy

The article describes the micromagnetic behavior of non- and pre-plastically deformed high strength steel samples under applied stress using different magnetic nondestructive methods such as magnetic Barkhausen noise analysis and hysteresis measurements. It was found that the maximum amplitude of Barkhausen noise (Mmax) increases with applied stress up to a certain point and then decreases again (so-called Mmax(sigma)-curve). Changes of magnetostriction, hysteresis curves and magnetic domain structures have been measured and have been further investigated to find out the reasons with respect to macro- and microscopic material behavior. The results obtained are mainly discussed on the basis of the Villari effect and the relation between applied stress and the Barkhausen noise parameters is described. It is concluded that the interaction between crystal and stress anisotropy is the main reason of the specific Mmax(sigma)-curve observed.