Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.44: Poster

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

Fabrication and characterization of 3d-sputtered giant magnetoimpedance sensors — •Indujan Sivanesarajah, Rudolph Gerlich, Gregor Buettel, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P. O. Box 151150, D66041, Saarbrücken, Germany

The influence of the variable width of a microstructured Cu spacer layer between microstructured NiFe/Ti multilayers with a fixed width on the magnetic softness, domain structure and giant magnetoimpedance (GMI) effect was investigated. The whole microstructure is fabricated by a multilevel lithography and sputtering process to accurately control alignment and width of the Cu spacer layer. Wide-field Kerr microscopy and MFM is employed to record differences of flux closure and subdomain structures at the edges of the microstructures and compared with hysteresis curves obtained by vibrating sample magnetometry of arrays of such microstructures. Additionally, SiO2 layers are deposited between the Cu and NiFe layers and their influence on the GMI studied by vector network analyser measurements. The results allow further optimization of field sensitivity and power consumption of thin-film based GMI sensors.