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MA: Magnetismus

MA 14: Magnetic Thin Films II

MA 14.5: Vortrag

Dienstag, 28. März 2006, 11:15–11:30, HSZ 03

Properties of sputtered softmagnetic trilayer sensors and their influence of the GMI-Effect — •Christian Schiefer, Henadzi Yakabchuk, and Erhard Kisker — Institut für Angewandte Physik, Heinrich-Heine Universität Düsseldorf, 40225 Düsseldorf

The GMI-effect gains more and more interest in research due to its characteristics in the detection of small magnetic fields. Compared to amorphous wires, sputtered trilayer structures have the advantage that they can be easily integrated in microchip structures. Annealed soft magnetic thin films based on FeSiBNbCu alloys show a GMI-Effect of about 100% with a sensitivity of 20%/Oe. The Influence of annealing, as well as the occurrence of an aging effect on the GMI effect are presented. The aging effect lead to an improvement in the GMI effect. This is a rarely discussed phenomenon in literature. Its occurrence is determined by various factors. Besides GMI-Mesurements, also other methods like STM or MOKE were applied to characterize the thin films.