B 24 Barkhausen effect in stepped motion of a plane domain boundary in gadolinium molybdate / V. Ya. Shur, E. L. Rumyantsev, V. P. Kuminov, A. L. Subbotin, V. L. Kozhevnikov // Physics of the Solid State. - 1999. - Vol. 41, № 2. - P269-273 : il. - Bibliogr. : p. 272-273 (18 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): МОЛИБДАТ ГАДОЛИНИЯ -- ДОМЕНЫ Аннотация: 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 Полный текст |