Controlling the domain wall dynamics in Fe-, Ni- and Co-based magnetic microwires

JOURNAL OF ALLOYS AND COMPOUNDS

卷:834

Article

Corte-Leon, P.¹  Gonzalez-Legarreta, L.^1,2  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, Dept QUIPRE, Nanomedice IDIVAL, Inorgan Chem, Avda Los Castros 46, Santander 39005, Spain

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

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

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

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

关键词: Magnetic microwires;    Domain wall propagation;    Magnetic anisotropy;    Magnetostriction;    Annealing;    Internal stresses;   

DOI  :  10.1016/j.jallcom.2020.155170

来源: Elsevier

【 摘 要 】

We studied influence of post-processing (annealing and stress-annealing) on domain wall dynamics in Fe-, Ni- and Co-based magnetic microwires with spontaneous and induced magnetic bistability. As-prepared Co-based microwires with low and negative magnetostriction present linear hysteresis loops. Magnetic bistability in Co-based microwires has been induced by annealing. Minimizing magnetoelastic anisotropy either by adjusting the chemical composition with a low magnetostriction coefficient or by heat treatment is an appropriate route for the domain wall dynamics optimization in magnetic microwires. Stress-annealing allows further improvement of domain wall velocity and hence is a promising method allowing optimization of the DW dynamics in magnetic microwires. The beneficial influence of stress-annealing on the DW dynamics is explained considering an increase in the volume of outer domain shell with transverse magnetization orientation in expense of decrease in the radius of the inner axially magnetized core. Such transverse magnetic anisotropy can affect the DWdynamics in similar way as the applied transverse magnetic field and hence is beneficial for the DWdynamics optimization. Thus, stress-annealing allows designing the magnetic anisotropy distribution more favorable for the DW dynamics improvement. Co-rich microwires with magnetic bistability induced by annealing present a considerable enhancement in the DW velocity upon applied tensile stress: exactly the opposite to the case of magnetic microwires with spontaneous magnetic bistability. Observed dependence has been explained considering decrease in the magnetostriction coefficient under effect of the applied stress. (c) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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