Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Magnetic Thin Films II

MA 18.10: Vortrag

Mittwoch, 24. März 2010, 17:45–18:00, H3

Investigation of soft-magnetic properties of thin FeCo films for contact-less temperature and strain sensor applications — •Claas Thede, Steffen Chemnitz, Iulian Teliban, Christoph Bechtold, and Eckhard Quandt — Christian-Albrechts-Universität zu Kiel

In magnetostrictive materials, magnetic properties like permeability or magnetization depend on the material’s strain, which can be caused by e.g. mechanical stress. If the magnetostrictive material is combined with another material of different thermal expansion coefficient, temperature changes have a similar effect. Furthermore, the coercive field strength of ferromagnetic materials depends on temperature due to its effect on domain wall mobility.

Therefore, magnetostrictive phases can be used as sensors with remote readout capability for mechanical stress and, if the above condition is met, temperature. In order to integrate magnetostrictive sensor phases into other materials, a technique for highly selective detection of magnetic properties is needed, e.g. frequency mixing.

We present a sensor based on this technique with additional phase sensitivity, capable of parallel measurement of permeability, magnetic moment, and relative changes of coercive field strength. Application of the sensor with respect to functionalized coatings with wear-resistant properties and integrated magnetostrictive phases (FeCo) is discussed.

Founding by the DFG via the priority program 1299 “HAUT” is gratefully acknowledged.

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