Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 18: Diamond II + Poster

KFM 18.5: Vortrag

Mittwoch, 14. März 2018, 16:30–16:50, E 124

Influence of WC-Co on the High-Frequency Properties of Soft Ferromagnetic Fe-Co-Hf-N Films Used for Sensor Application — •Stefan Beirle, Klaus Seemann, and Harald Leiste — Karlsruhe Institute of Technology (IAM-AWP), 76344 Eggenstein-Leopoldshafen, Germany

The thermal and mechanical induced high frequency property changes of soft ferromagnetic Fe-Co-Hf-N films with an in-plane uniaxial anisotropy are promising for the application for sensor systems. For example, one can use the sensor signal to measure the cutting tool temperature during metal processing. Consequently, it is necessary to investigate how the ferromagnetic film interacts with a cemented carbide substrate, which is typically used for cutting tools, but consists itself of a hard ferromagnetic Co phase. In order to overcome the exchange interactions between the substrate and the ferromagnetic film, it is possible to predeposit a non-ferromagnetic buffer layer on the WC-Co substrate. For this purpose different hard coatings like Ti-N, Ti-Al-N and an electrically insulating Si-O buffer layer were investigated. In order to determine the static and dynamic magnetic properties of the film, MOKE measurements were carried out as well as the complex permeability was determined. The buffer materials show a different decoupling behaviour regarding the high frequency permeability due to different electrical and microstructural properties. The decoupled films show ferromagnetic resonance absorbance and the FWHM of the resonance line can be tuned by increasing the electrically insulating buffer layer thickness.