Optimisation of sensitivity and time constant of thermal sensors based on magnetoelastic amorphous bilayers

E. Kaniusas*, H. Pfützner, L. Mehnen, J. Kosel, J. C. Téllez-Blanco, E. Mulasalihovic, T. Meydan, M. Vázquez, M. Rohn, C. Malvicino, B. Marquardt

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

12 Scopus citations


The paper concerns bilayers as thermal sensors which consist of a magnetostrictive amorphous layer (ML) glued on a nonmagnetic metal counter layer (CL). Different thermal expansion coefficients of ML and CL yield by temperature change mechanical stress of constant sign in the ML. The corresponding change of the ML-permeability μ is registered by a pick-up coil. The main target of the study is to connect high temperature sensitivity with low time constant. A good compromise results by reducing the glue layer thickness, minimizing the bilayer dimensions and leaving ML and CL unglued inside the pick-up coil. First prototypes show a bilayer size close to 20mm×3mm, the ML thickness being close to 30μm, the CL thickness up to 100μm. Preliminary results show a sensitivity up to 3% change of μ per K in the temperature range from 10 to 40°C, the time constant being in the range of 1-2s.

Original languageEnglish (US)
Pages (from-to)198-201
Number of pages4
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - Apr 28 2004
Externally publishedYes
EventProceedings of the VI Latin American Workshop on Magnetism - Chihuahua, Mexico
Duration: Apr 7 2003Apr 11 2003


  • Amorphous materials
  • Magnetic measurements
  • Thermal analysis

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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