Axial Domain Wall Dimension in Bistable Glass-Coated Microwire

M. Kladivová, J. Ziman, P.Duranka Department of Physics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

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The properties of the so-called head-to-head domain wall in a bistable glass-coated microwire are studied. The stray field produced by this wall affects the shape of the voltage peaks induced in the pick-up coils in the Sixtus-Tonks experiment. If the shape of these peaks is to be used to obtain information about the wall geometry, the pick-up coil parameters (length and radius) have to be taken into account. In the experiment presented in this paper, the two pairs of pick-up coils are used. The coils differ only in their radii, which means that differences between the induced peaks in the coils are only caused by the stray field. Comparison of theoretical and experimental voltage peaks provides information about shortening of the axial dimension of the propagating domain wall with increasing applied axial magnetic field. This effect is more visible when a pair of pick-up coils with smaller radii is used in the experiment. Preliminary analysis and comparison of the signals indicate that the proposed method could help in understanding the mechanism of unidirectional effect.

DOI:10.12693/APhysPolA.137.855 topics: bistable glass-coated microwires, magnetic domain wall, Sixtus-Tonks experiment