Abstract
Barkhausen pulses generated in stepped motion of a single plane domain boundary (PDB) are investigated experimentally in single-crystalline wafers of the extrinsic ferroelastic ferroelectric gadolinium molybdate containing artificial pinning centers of the “field inhomogeneity” type near the edges of the sample. Two scenarios of the evolution of a PDB in interaction with “defects” are proposed on the basis of analyzing the shape of the pulses in a linearly increasing field: small changes of the pulse shape in a weak field and the generation of wedge domains in a strong field. The proposed mechanism of PDB motion due to the generation of steps near the edge of the sample and their longitudinal motion provides a means for explaining the experimentally observed linear field dependence of the PDB velocity and for determining the velocity of the steps.
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Fiz. Tverd. Tela (St. Petersburg) 41, 301–305 (February 1999)
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Shur, V.Y., Rumyantsev, E.L., Kuminov, V.P. et al. Barkhausen effect in stepped motion of a plane domain boundary in gadolinium molybdate. Phys. Solid State 41, 269–273 (1999). https://doi.org/10.1134/1.1130766
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DOI: https://doi.org/10.1134/1.1130766