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Article Dans Une Revue Smart Materials and Structures Année : 2019

Intrinsic versus shape anisotropy in micro-structured magnetostrictive thin films for magnetic surface acoustic wave sensors

Harshad Mishra
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Michel Hehn
Daniel Lacour
Omar Elmazria
Karine Dumesnil
Sébastien Petit
Sami Hage-Ali

Résumé

This work aims at studying the interaction between surface acoustic waves (SAW) and micro-structured magnetostrictive layers under a magnetic field with a perspective to develop magnetic field sensors. The impact of the competition between the strong intrinsic magnetic anisotropy of the magnetic material and the shape anisotropy of the interdigitated transducer (IDT) fingers introduced by the micro-structuration is investigated. Therefore, the macroscopic and microscopic magnetic properties of the IDT and their influence on the magneto-acoustic response are studied. A SAW resonator with the IDTs made of the magnetostrictive thin film was elaborated and the magnetic surface acoustic wave (MSAW) response under a magnetic field was performed and discussed. Depending on the energy balance, the anisotropy gets modified and a correlation with the MSAW sensitivity to an externally applied magnetic field is made.
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Dates et versions

hal-02360172 , version 1 (17-01-2020)

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Harshad Mishra, Michel Hehn, Daniel Lacour, Omar Elmazria, Nicolas Tiercelin, et al.. Intrinsic versus shape anisotropy in micro-structured magnetostrictive thin films for magnetic surface acoustic wave sensors. Smart Materials and Structures, 2019, 28 (12), pp.12LT01. ⟨10.1088/1361-665X/ab522d⟩. ⟨hal-02360172⟩
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