Changes in properties of thin-film magnetoimpedance element by Joule heating

[摘要] We investigated the effect of Joule heating on the magnetoimpedance characteristics of Co-based amorphous thin films. The simple Joule heating with application of a current directly to the element with a low intensity in a short time did not contribute to modifications of the impedance profile. Joule heating under a magnetic field in a short time changed the impedance profile. The magnetic field at which the impedance had a peak was shifted to a lower field. This shows the potential of controlling the magnetic characteristics of an element by Joule heating. A high heating current degraded the magnetoimpedance, which was attributed to the crystallisation of the material. We confirmed the crystallisation of the element by a thermal conduction analysis based on a finite-element simulation and by observing the magnetic domain structure using a Kerr-effect microscope.

[发布日期] 2021-12-01

[关键词] Magnetoimpedance;Thin-film;Anistoropy;Joule heating;Crystallization