Tungsten covering induced effect of magnetic bistability in amorphous magnetic microwires
The effect of non-magnetic tungsten coatings on the magnetic behavior of glass-coated Co-based amorphousmicrowires is investigated. Tungsten layers with thicknesses ranging from 300 to 1000 nm were deposited ontothe glass sheath, and their influence on magnetization reversal, magnetic bistability, a...
| Autores: | , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:dnet:ruidera_____::eabc352aad45dab53ba9ff4697faf419 |
| Acceso en línea: | https://hdl.handle.net/10578/48217 |
| Access Level: | acceso abierto |
| Palabra clave: | Amorphous soft magnetic materials Magnetic bistability Magnetic sensors Magnetic wires Magnetoelastic anisotropy Tungsten coatings |
| Sumario: | The effect of non-magnetic tungsten coatings on the magnetic behavior of glass-coated Co-based amorphousmicrowires is investigated. Tungsten layers with thicknesses ranging from 300 to 1000 nm were deposited ontothe glass sheath, and their influence on magnetization reversal, magnetic bistability, and domain wall dynamicswas examined. Hysteresis measurements reveal a clear distinction between coated and uncoated regions: uncoated segments exhibit smooth, non-bistable magnetization reversal, whereas tungsten-coated regions showpronounced magnetic bistability. The observed bistability originates from mechanical stresses generated in thetungsten film and transferred through the glass coating to the metallic core, thereby modifying the magnetoelastic anisotropy. Spatially resolved measurements reveal a gradual reduction of the magnetization jump nearthe coating edges, indicating the formation of inclined or partial (helical) bistable states due to stress relaxation.Tungsten thickness is identified as a key control parameter, with thicker coatings producing stronger and moreuniform stress fields that stabilize axial bistability, while thinner coatings favor partial bistability and enhancedtransverse susceptibility. Sixtus–Tonks measurements further confirm thickness-dependent variations in domainwall pinning and coercivity. These results demonstrate that non-magnetic tungsten coatings provide an effectivestress-mediated approach for tailoring magnetic states in amorphous microwires for bistable and giantmagnetoimpedance-based sensing applications. |
|---|