Influence of direct DC bias current on stepped magnetoimpedance profile and changes in domain structure

Article type: Research Article

Authors: Kikuchi, Hiroaki^a; | Nakamura, Hikaru^a | Sumida, Chihiro^a

Affiliations: [a] Faculty of Science and Engineering, Iwate University, Morioka, Iwate, Japan

Correspondence: [*] Corresponding author: Hiroaki Kikuchi, Faculty of Science and Engineering, Iwate University, Morioka Iwate, 020-8551, Japan. Tel.: +81 19 621 6890; Fax: +81 19 621 6890; E-mail: [email protected]

Abstract: We investigated the effects of DC bias current applied directly to the elements on the inclined easy axis thin-film magnetoimpedance element indicating a discontinuous impedance jump. We clarified that the DC bias current contributes to changes in the configuration of domain structure, which induces modification of impedance profiles on the 20 μm-wide element. On the other hand, 40 and 80 μm-wide elements did not show the apparent changes on the magnetoimpedance profiles. The influence of DC bias current on jumping point is not so much, which is attributed to the small bias magnetic field generated by the current; the limited bias level is not high due to Joules heating by the current.

Keywords: Magnetoimpedance, discontinuous jump, DC bias, inclined easy axis, thin-film

DOI: 10.3233/JAE-171095

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 1, pp. 123-128, 2019