Review of Domain Wall Dynamics Engineering in Magnetic Microwires

Nanomaterials

Lorena González-Legarreta¹  Paula Corte-Leon¹  Valentina Zhukova¹  Ahmed Talaat¹  Mihail Ipatov¹  Arcady Zhukov¹  JuanMaria Blanco²  Jesus Olivera³ 

[1] Department Advanced Polymers and Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of Basque Country, UPV/EHU, 20018 San Sebastian, Spain;Department Applied Physics I, EIG, University of Basque Country, UPV/EHU, 20018 San Sebastian, Spain;Nanoscience Research Laboratory, Pontificia Universidad Catolica Madre y Maestra, Autopista Duarte, Km 1 ½, 51000 Santiago, Dominican Republic;

关键词: domain wall propagation;    large Barkhausen jump;    magnetic bistability;    magnetic anisotropy;    magnetostriction;    magnetic microwire;   

DOI  :  10.3390/nano10122407

来源: DOAJ

【 摘 要 】

The influence of magnetic anisotropy, post-processing conditions, and defects on the domain wall (DW) dynamics of amorphous and nanocrystalline Fe-, Ni-, and Co-rich microwires with spontaneous and annealing-induced magnetic bistability has been thoroughly analyzed, with an emphasis placed on the influence of magnetoelastic, induced and magnetocrystalline anisotropies. Minimizing magnetoelastic anisotropy, either by the selection of a chemical composition with a low magnetostriction coefficient or by heat treatment, is an appropriate route for DW dynamics optimization in magnetic microwires. Stress-annealing allows further improvement of DW velocity and hence is a promising method for optimization of DW dynamics in magnetic microwires. The origin of current-driven DW propagation in annealing-induced magnetic bistability is attributed to magnetostatic interaction of outer domain shell with transverse magnetization orientation and inner axially magnetized core. The beneficial influence of the stress-annealing on DW dynamics has been explained considering that it allows increasing of the volume of outer domain shell with transverse magnetization orientation at the expense of decreasing the radius of inner axially magnetized core. Such transverse magnetic anisotropy can similarly affect the DW dynamics as the applied transverse magnetic field and hence is beneficial for DW dynamics optimization. Stress-annealing allows designing the magnetic anisotropy distribution more favorable for the DW dynamics improvement. Results on DW dynamics in various families of nanocrystalline microwires are provided. The role of saturation magnetization on DW mobility improvement is discussed. The DW shape, its correlation with the magnetic anisotropy constant and the microwire diameter, as well as manipulation of the DW shape by induced magnetic anisotropy are discussed. The engineering of DW propagation through local stress-annealing and DW collision is demonstrated.

【 授权许可】

Unknown