Flexible magnetoimpedance sensor

Li, Bodong; Kavaldzhiev, Mincho; Kosel, Jürgen

Flexible magnetoimpedance sensor

Type

Article

Authors

Li, Bodong

Kavaldzhiev, Mincho

Kosel, Jürgen

KAUST Department

Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Sensing, Magnetism and Microsystems Lab

Date

2015-03

Abstract

Flexible magnetoimpedance (MI) sensors fabricated using a NiFe/Cu/NiFe tri-layer on Kapton substrate have been studied. A customized flexible microstrip transmission line was employed to investigate the MI sensors's magnetic field and frequency responses and their dependence on the sensors's deflection. For the first time, the impedance characteristic is obtained through reflection coefficient analysis over a wide range of frequencies from 0.1 MHz to 3 GHz and for deflections ranging from zero curvature to a radius of 7.2 cm. The sensor element maintains a high MI ratio of up to 90% and magnetic sensitivity of up to 9.2%/Oe over different bending curvatures. The relationship between the curvature and material composition is discussed based on the magnetostriction effect and stress simulations. The sensor's large frequency range, simple fabrication process and high sensitivity provide a great potential for flexible electronics and wireless applications.

Citation

Li, B., Kavaldzhiev, M. N., & Kosel, J. (2015). Flexible magnetoimpedance sensor. Journal of Magnetism and Magnetic Materials, 378, 499–505. doi:10.1016/j.jmmm.2014.11.067

Acknowledgements

Research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST).