Magnetostrictive LC-circuits as mechanical sensors

  • M. Frommberger
  • A. Ludwig
  • M. Tewes
  • E. Quandt
Conference paper


A remote interrogatable highly sensitive mechanical sensor based on softmagnetic magnetostrictive thin films has been developed. This sensor is very interesting for stress and torque measurements on rotating or hidden objects. It consists of a resonating circuit (LC-tag) with a magnetically sandwiched strip inductor and a thin film capacitor. The resonance frequency of this device is about 500 MHz with quality factors about 8. First measurements with the sensor in a bending test jig have shown high sensitivity to applied strain. A figure of merit (defined as ∆f/f 0/∆ε on the order of 1000 could be obtained.


Resonance Frequency Applied Strain Easy Axis Magnetic Layer Stress Sensor 
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  1. 1.
    A. Ludwig, M. Löhndorf, M. Tewes, E. Quandt, IEEE Trans. on Magn. Vol. 37, No. 4, pp. 2690–2692, 2001.CrossRefGoogle Scholar
  2. 2.
    A. Ludwig, M. Tewes, S. Glasmachers, M. Löhndorf, E. Quandt, JMMM 242245, pp. 1126–1131, 2002.CrossRefGoogle Scholar
  3. 3.
    A. Ludwig, M. Frommberger, C. Zanke, S. Glasmachers, E. Quandt, “Smart structures and Materials 2002”, Proceedings of SPIE Vol. 4699, pp. 542–552, 2002.CrossRefGoogle Scholar
  4. 4.
    C. H. Tyren, D. G. Lord, Magnetoelastic Stress Sensor, United States Patent 5297439, 1994.Google Scholar
  5. 5.
    A. Ludwig, M. Tewes, E. Quandt, Sensoren und Mess-Systeme 2002, VDE Verlag Berlin Offenbach, pp. 309–312, 2002.Google Scholar
  6. 6.
    V. Korenivski and R. B. van Dover, IEEE Trans. Magn. 34, p. 1375, 1998.CrossRefGoogle Scholar
  7. 7.
    V. Korenivski, JMMM 215–216, pp. 800–806, 2000.CrossRefGoogle Scholar
  8. 8.
    A. Sukstanskii, V. Korenivski and A. Gromov, J. Appl. Phys. 89 (1), 2001.Google Scholar
  9. 9.
    M. Löhndorf, T. Duenas, M. Tewes, E. Quandt, M. Rührig, J. Wecker, Appl. Phys. Lett. 81 (2), pp. 313–315, 2002CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • M. Frommberger
    • 1
  • A. Ludwig
    • 1
  • M. Tewes
    • 1
  • E. Quandt
    • 1
  1. 1.Smart Materials GroupCenter of Advanced European Studies and Research (casear)BonnGermany

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