Abstract
Amorphous ferromagnetic materials in the form of microwires are of interest for the development of various sensors. This paper analyzes and argues for the use of microwires of two basic compositions of Co71Fe5B11Si10Cr3 and Fe3.9(4.9)Co64.82B10.2Si12Cr9(8)Mo0.08 as stress/strain and temperature sensors, respectively. The following properties make them suitable for innovative applications: miniature dimensions, small coercivity, low anisotropy and magnetostriction, tunable magnetic structure, magnetic anisotropy, and Curie temperature by annealing. For example, these sensors can be used for testing the internal stress/strain condition of polymer composite materials and controlling the temperature of hypothermia treatments. The sensing operation is based on the two fundamental effects: the generation of higher frequency harmonics of the voltage pulse induced during remagnetization in wires demonstrating magnetic bistability, and magnetoimpedance.
Highlights
Amorphous alloys based on 3D metals produced in the form of ribbons and wires are excellent soft magnetic materials used in a large number of applications, including sensors [1,2,3,4].The choice of composition depends on a particular application, but generally, the alloy includes (Fe,Co,Ni)70–85 (Si,B)15–30 where the metalloids Si and B help glass formation [5]
We have recently proposed a direct method of measuring the temperature during current annealing, which is based on using a reference sample, the temperature of which is automatically set equal to the temperature of the annealed microwire
We investigated the performance of ferromagnetic amorphous microwires as mechanical stress and temperature sensors utilizing the effects of fast remagnetization and magnetoimpedance
Summary
Amorphous alloys based on 3D metals produced in the form of ribbons and wires are excellent soft magnetic materials used in a large number of applications, including sensors [1,2,3,4]. The short-range ordering can be modified by various annealing treatments [22,23] This is important from the perspective of tuning the magnetic structure and controlling the magnetic parameters such as uniaxial anisotropy, magnetostriction, and Curie temperature [24,25,26,27]. The application of tensile stress along the wire contributes to long-range axial anisotropy and strongly affects the remagnetization process and magnetoimpedance This magnetic configuration is desirable for stress/strain sensing with the use of microwires and is in the focus of this work. The main findings of the paper are summarized in the Conclusion
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