Graphene has emerged as the most popular subject area in the active research field since its discovery in 2004. The published documents illustrate the popularity of Graphene research and innovations, spontaneously increased from about 150 in 2004 to 21,500 in 2018. Graphene is relatively young but high-hope for markets. The cover photo of May 2019 issue describes the structure of a cylindrical Graphene to celebrate the 15th anniversary of it's discovery.
Magnetic microwires for sensor applications
Arcady Zhukov1, 2, 3*, Paula Corte-León1, 2, Lorena González-Legarreta1, Mihail Ipatov1, 2, Ahmed Talaat1, 2, Juan M. Blanco2, Julian Gonzalez1, Valentina Zhukova1, 2
1Dpto. Fisica de Materiales, Fac. Quimicas, UPV/EHU, Paseo Manuel Lardizabal, 3, San Sebastian, 20018, Spain
2Dpto. de Física Aplicada, EIG, UPV/EHU, San Sebastian, Europa Plaza, 1,20018, Spain
3IKERBASQUE, Basque Foundation for Science, Bilbao, 48011, Spain
Adv. Mater. Lett., 2019, 10 (5), pp 305-311
Publication Date (Web): Jan 14, 2019
Copyright © 2019 VBRI Press
The impact of post-processing on soft magnetic properties and the giant magnetoimpedance (GMI) effect of Fe- and Co-based glass-coated microwires is evaluated. A remarkable improvement of magnetic softness and GMI effect is observed in Fe-rich glass-coated microwires subjected to stress annealing. Frequency dependence of GMI ratio of stress-annealed Fe-rich microwires has been discussed considering frequency dependence of the skin penetration depth, δ, as well as magnetic anisotropy distribution within the metallic nucleus. Annealed and stress-annealed Co-rich microwires present rectangular hysteresis loop and single and fast domain wall propagation. However, Co-based stress-annealed microwires present high magnetoimpedance ratio. Observed stress-induced anisotropy and related changes of magnetic properties are discussed considering internal stresses relaxation and “back-stresses”.
Magnetic microwires, GMI effect, Domain wall propagation, Magnetic anisotropy, Internal stresses.