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High-frequency magnetoelastic multilayer thin films and applications

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4 Author(s)
Ludwig, A. ; Caesar, Bonn, Germany ; Frommberger, M. ; Tewes, M. ; Quandt, E.

This paper gives an overview of recent advances in applying magnetoelastic thin films in inductive high-frequency devices. Single and multilayer films were fabricated and optimized with respect to application in stress-sensitive inductors, which are operated at high frequencies. These films require high magnetic permeability, high ferromagnetic resonance frequency, low losses, and a high inverse magnetostrictive effect. A thin-film LC circuit with incorporated magnetic thin films, sensitive to applied external magnetic field and/or applied stress, is presented. It operates at a frequency of about 0.5 GHz and has a quality factor of 8, allowing wireless interrogation, e.g., by inductive coupling. Applied strain in a range <0.1% leads to a change of resonance frequency of up to 20%.

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Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 5 )