Magneto-optical study of domain wall dynamics and giant Barkhausen jump in magnetic microwires

Magneto-Optical Study of the Surface Reversal Process in Amorphous Glass-Coated Microwires With Positive Magnetostriction

“…As it is seen, a magnetic contrast consisting of two parallel black and white stripes appears in each configuration. A similar magnetic contrast was observed on microwires with negative magnetostriction characterized by circular surface domain structure [8]. However, the same black and white contrast was obtained when the sample has been rotated 180°p erpendicularly to its axis, which proves that the contrast does not correspond to the circular domains.…”

“…Along with geometry of anisotropies, the domain wall dynamics can be strongly influenced by surface domain structure, too [6]. Most recent papers on surface domain structure of amorphous glass-coated microwires were devoted to the study of Co-rich samples with negative [7] or nearly zero [8] coefficient of magnetostriction. In this kind of wire, circular domains appear on the surface, making them promising candidates for sensor applications based on giant magnetoimpedance effect (GMI) [9].…”

Angular Dependence of Magnetization Reversal in Microwire Studied by MOKE

“…In such cases, application of the Kerr-effect based measuring methods is desirable. Magneto-optical methods present a way of nondestructive, contactless measurement of magnetic properties and are successfully used to study various properties of micro-and nanomaterials [5][6][7]. It is mostly due to their ability of detecting very small changes of magnetization, even if they happen over a very short period of time.…”