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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.43: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

Driving power dependency of thin-film GMI sensors with insulating layers — •Gregor Buettel, Vlad Serea, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P. O. Box 151150, D66041, Saarbrücken, Germany

The dependence of the ac current on the giant magnetoimpedance (GMI) effect of Permalloy-based thin-film GMI sensors with an insulating SiO2 layer between the Cu core layer and surrounding magnetic NiFe/Ti multilayers was investigated [1]. The input power is decreased from 0 to -25 dBm without showing a decrease of the maximum GMI ratio in the skin-effect regime and decreasing the necessary ac frequency. In the ferromagnetic resonance regime a significant and unreported modification of the shape of the GMI curve shows up, especially at the Kittel mode frequency. It strongly depends on the driving power, which is contributed to microwave-assisted domain switching. In comparison with conventionally fabricated thin-film Permalloy GMI sensors [2], the control of the current path in this newly designed device geometry by insulating layers and multilevel deposition shows a strong potential to increase the GMI ratio and field sensitivity and to reduce the driving power.

[1] R. Betzholz et al., EPL 101, 17005 (2013) [2] G. Buettel et al., APL 111, 232401 (2017)