Abstract
The temperature dependencies of magnetoimpedance (MI) and stress impedance (SI) were analyzed both in the as-quenched soft magnetic Co68.5Fe4Si15B12.5 ribbons and after their heat treatment at 425 K for 8 h. It was found that MI shows weak changes under the influence of mechanical stresses in the temperature range of 295–325 K and SI does not exceed 10%. At higher temperatures, the MI changes significantly under the influence of mechanical stresses, and SI variations reach 30%. Changes in the magnetoelastic properties for the different temperatures were taken into consideration for the discussion of the observed MI and SI responses. The solutions for the problem of thermal stability of the magnetic sensors working on the principles of MI or SI were discussed taking into account the joint contributions of the temperature and the applied mechanical stresses.
Highlights
There are different sensing technologies based on the coupling of the magnetic and electric/ elastic properties of soft ferromagnets [1,2]
Magnetic hysteresis loops were measured by the induction method in a longitudinal magnetic field with a frequency of 1 kHz
The low positive values of the magnetostriction in the heat-treated ribbons are maintained in the temperature range from 295 to 325 K, and cause small changes in the magnetoimpedance under the influence of temperature and mechanical stresses, as well as the low stress-impedance effect
Summary
There are different sensing technologies based on the coupling of the magnetic and electric/ elastic properties of soft ferromagnets [1,2]. The magnetoimpedance (MI) [6,7,8] and the stress-impedance (SI) [9,10] effects, consisting in a change of the total electric impedance of a ferromagnetic conductor under the influence of the external magnetic field and deformations, respectively, are well studied phenomena in amorphous and nanocrystalline wires, composite wires [11], ribbons and thin films. In some cases, they were investigated in a condition of application of torsional stress [12]. Despite a rather long history of MI and SI effect investigation, the fundamentals related to these phenomena and the search for new MI and SI materials are still under the special attention of researchers
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