Abstract
The influence of post-processing conditions on the magnetic properties of amorphous and nanocrystalline microwires has been thoroughly analyzed, paying attention to the influence of magnetoelastic, induced and magnetocrystalline anisotropies on the hysteresis loops of Fe-, Ni-, and Co-rich microwires. We showed that magnetic properties of glass-coated microwires can be tuned by the selection of appropriate chemical composition and geometry in as-prepared state or further considerably modified by appropriate post-processing, which consists of either annealing or glass-coated removal. Furthermore, stress-annealing or Joule heating can further effectively modify the magnetic properties of amorphous magnetic microwires owing to induced magnetic anisotropy. Devitrification of microwires can be useful for either magnetic softening or magnetic hardening of the microwires. Depending on the chemical composition of the metallic nucleus and on structural features (grain size, precipitating phases), nanocrystalline microwires can exhibit either soft magnetic properties or semi-hard magnetic properties. We demonstrated that the microwires with coercivities from 1 A/m to 40 kA/m can be prepared.
Highlights
The development of new magnetic devices is substantially affected by technological progress in the field of magnetic materials [1,2,3].The performance of the magnetic devices is determined by their properties: the right choice of magnetic material allows for devices’ performance improvement
The sign and value of the magnetostriction coefficient affect the hysteresis loops of amorphous microwires, since magnetoelastic anisotropy is the main source of magnetic anisotropy in amorphous materials
We showed that the magnetic properties of glass-coated microwires prepared by the Taylor–Ulitovsky method can be tuned in an as-prepared state or further modified by appropriate post-processing
Summary
The development of new magnetic devices (sensors, actuators, magnetometers, transformers, motors, etc.) is substantially affected by technological progress in the field of magnetic materials [1,2,3].The performance of the magnetic devices is determined by their properties: the right choice of magnetic material allows for devices’ performance improvement. Amorphous and nanocrystalline materials prepared by means of rapid melt quenching present unique combination of physical properties, such as superior magnetic softness, dimensionality suitable for various industrial applications, and excellent mechanical properties [4,5,6]. Several fabrication techniques involving rapid melt quenching allow preparation of amorphous materials with either cylindrical (wires) or planar (ribbons) geometries [4,5,6]. Amorphous ribbons and wires can present rather different magnetic properties and, they are suitable for a wide range of applications. Amorphous, nanocrystalline, and even crystalline wires can exhibit rather unique magnetic properties, such as the giant magneto-impedance effect (GMI) or fast magnetization switching associated with a perfectly rectangular hysteresis loop shape and attributed to a large Barkhausen jump [7,8,9,10,11,12,13,14,15]
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