24–27 Jun 2024
Košice, Slovakia
Europe/Bratislava timezone

Temperature Stability of Giant Magnetoimpedance Effect in Tensile Stress-Annealed VITROVAC 6025 I50 Ribbon

P-34-3
26 Jun 2024, 16:00
2h
MINERVA

MINERVA

Doktora Kostlivého 576/1
POSTER Topic 3 - Magnetic sensors POSTER

Speaker

Miloš Jakubčin (Institute of Experimental Physics SAS)

Description

Co-rich amorphous ribbons with nearly zero magnetostriction are well known for their outstanding giant magnetoimpedance (GMI) sensor characteristics [1,2]. However, their relatively low Currie temperature can be a disadvantage for their application at elevated temperatures. In this work, the effects of temperature on magnetoimpedance response were investigated in stress annealed commercial amorphous VITROVAC® 6025 I50 ribbons. As-quenched ribbons were subjected to tensile stress annealing at 700 MPa and 350C in order to induce transversal magnetic anisotropy, thereby enhancing the GMI sensitivity of the material. We utilized a specially designed set-up based on the impedance analyzer, which allowed us to measure the sample’s impedance up to 250C. Temperature stability of GMI during keeping the sample at 100C, 150C and 200C was monitored for different times up to 10 hours. For the sake of comparison, the GMI characteristics were also collected at room temperature after each high temperature measurement. The evaluated ΔZ/Z ratios and field sensitivities η of GMI taken at 100 and 150 C showed only negligible changes during entire 10 hour time monitoring. On the other hand, a small continuous decrease of induced anisotropy field is observed after keeping the sample at 200C up to 4 hours (Fig. 1). Possible mechanisms behind the observed GMI changes as well as the application potential of stress annealed VITROVAC® 6025 amorphous ribbons for use in magnetic sensors at elevated temperatures will be briefly discussed.

Fig. 1 ΔZ/Z ratios and field sensitivities η of VITROVAC® 6025 I50 measured at frequency 10 MHz after keeping the sample at 200C for different time.

Acknowledgements

This work was supported by the projects APVV-19-0369, VEGA 2/0148/23 and JRP NOMAGRAD. We thank Dr. G. Herzer and T. Strache from Vacuumschmelze GmbH for providing us with stress annealed samples.

References

[1] G. V. Kurlyandskaya, V. M. Prida, B. Hernando, J. D. Santos, M. L. Sánchez, and M. Tejedor, “GMI sensitive element based on commercial Vitrovac® amorphous ribbon,” Sensors and Actuators A: Physical, vol. 110, no. 1–3. Elsevier BV, pp. 228–231, Feb. 2004. doi: 10.1016/j.sna.2003.09.044.
[2] M.-H. Phan and H.-X. Peng, “Giant magnetoimpedance materials: Fundamentals and applications,” Progress in Materials Science, vol. 53, no. 2. Elsevier BV, pp. 323–420, Feb. 2008. doi: 10.1016/j.pmatsci.2007.05.003.

Primary author

Miloš Jakubčin (Institute of Experimental Physics SAS)

Co-author

Dr Ivan Škorvánek (Institute of Experimental Physics SAS)

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