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Proceedings Paper

Magnetoelastic thin films and multilayers for high-frequency applications
Author(s): Alfred Ludwig; Michael Frommberger; Christel Zanke; Stefan Glasmachers; Eckhard Quandt
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Paper Abstract

Magnetoelastic and magnetic high-frequency properties of single and multilayer thin films are investigated with respect to applications in micro-inductors and as remote-interrogated sensors for mechanical quantities. The basic structure is a thin film inductor incorporating a magnetic material in order to enhance the inductance. In case of a sensor the inverse magnetostriction is used to change the permeability of the magnetic material and thus the inductance of the device. Materials properties like saturation magnetization, anisotropy field, resulting domain structures, electrical resistivity as well as the stress state of the films have to be adjusted carefully in order to meet certain requirements like high cut-off frequencies combined with low losses, and a high and controllable inverse magnetostrictive effect. In this paper (Fe-Co/Fe-Co- B-Si) multilayers are investigated in terms of their magnetic, high-frequency, and structural properties. (Fe50Co50Cp80B20) multilayers, e.g., have been fabricated which show ferromagnetic resonance frequencies up to 5 GHz while exhibiting a high inverse magnetostrictive effect up to the GHz frequency range. The obtained results for first LC circuits realized using (Fe50Co50/Co80B20) multilayers are discussed.

Paper Details

Date Published: 11 July 2002
PDF: 11 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.475010
Show Author Affiliations
Alfred Ludwig, Ctr. of Advanced European Studies and Research (Germany)
Michael Frommberger, Ctr. of Advanced European Studies and Research (Germany)
Christel Zanke, Ctr. of Advanced European Studies and Research (Germany)
Stefan Glasmachers, Ctr. of Advanced European Studies and Research (Germany)
Eckhard Quandt, Ctr. of Advanced European Studies and Research (Germany)


Published in SPIE Proceedings Vol. 4699:
Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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