Route of magnetoimpedance and domain walls dynamics optimization in Co-based microwires

JOURNAL OF ALLOYS AND COMPOUNDS

卷:830

Article

Gonzalez-Legarreta, L.^1,2  Corte-Leon, P.¹  Zhukova, V.^1,3  Ipatov, M.^1,3  Blanco, J. M.³  Churyukanova, M.⁴  Taskaev, S.⁵  Zhukov, A.^1,3,6 

[1] Univ Basque Country, Dept Fis Mat, Fac Quim, San Sebastian 20018, Spain

[2] Univ Cantabria, Nanomedice IDIVAL, Inorgan Chem, Dept QUIPRE, Avda Castros 46, Santander 39005, Spain

[3] Univ Basque Country, Dept Fis Aplicada, EIG, San Sebastian 20018, Spain

[4] Natl Univ Sci & Technol MISIS, Moscow 119049, Russia

[5] NRU South Ural State Univ, Chelyabinsk, Russia

[6] Ikerbasque, Basque Fdn Sci, E-48011 Bilbao, Spain

关键词: Magnetic microwires;    Giant magnetoimpedance;    Magnetoelastic anisotropy;    Magnetostriction;    Annealing;    Internal stresses;   

DOI  :  10.1016/j.jallcom.2020.154576

来源: Elsevier

【 摘 要 】

The influence of post-processing (annealing and stress-annealing) on the magnetic softness, Giant magnetoimpedance (GMI) effect and domain wall dynamics of Fe3.6Co69.2Ni1B12.5Si11Mo1.5C1.2 glass-coated microwires is studied. As-prepared Co-rich glass-coated microwire presents linear hysteresis loops and rather higher magnetoimpedance ratio with double-peak magnetic field dependence, typical for materials with transverse magnetic anisotropy. Considerable magnetic hardening and transformation of linear hysteresis loop with low coercivity (H-c approximate to 4 A/m) into rectangular with H-c approximate to 90 A/m upon annealing without stress is observed. However, we observed remarkable MI effect improvement at certain annealing conditions. Stress-annealing of studied microwire allows considerable magnetoimpedance ratio and domain wall velocity increasing. Additionally, remanent magnetization growth and coercivity decrease are generally observed upon stress annealing. Frequency dependence of maximum GMI ratio for as-prepared and annealed samples is evaluated. The obtained frequency dependence of the maximum GMI ratio allows determination of the optimal GMI measurement conditions for each sample. The observed stressinduced anisotropy and related changes in magnetic properties are discussed considering the internal stresses relaxation and back-stresses. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

Free