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Evaluation of high‐sensitivity FeGa/PZT stacked‐layer magnetic sensor
Author(s) -
Hamashima Mio,
Saito Chihiro,
Nakamura Motoichi,
Muro Hideo
Publication year - 2012
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11392
Subject(s) - magnetostriction , sensitivity (control systems) , materials science , piezoelectricity , magnetic field , layer (electronics) , stress (linguistics) , voltage , acoustics , optoelectronics , finite element method , biasing , nuclear magnetic resonance , electrical engineering , electronic engineering , composite material , structural engineering , engineering , physics , linguistics , philosophy , quantum mechanics
An FeGa/PZT stacked‐layer magnetic sensor was studied. The prototype sensor was 15 mm long and 6 mm wide with two 880‐μm‐thick FeGa layers and a 590‐μm‐thick PZT layer. The theoretical sensitivity using a simple model was calculated to be 69.6 mV/Oe. The resonant modes were analyzed using an FEM simulator, resulting in a fundamental resonant frequency of 5.38 kHz. A magnetic field was applied to the longitudinal direction of the fabricated sensor to cause longitudinal stress magnetostrictively, which produced a piezoelectric output voltage in the PZT layer. The dependence of the magnetic sensitivity on the DC bias magnetic field was evaluated, together with the frequency characteristics and the temperature dependence. The measured sensitivity roughly agreed with the calculated one. A prototype with a single magnetostrictive layer was also fabricated and evaluated to investigate the possibility of operation as a resonant sensor. © 2012 Wiley Periodicals, Inc. Electron Comm Jpn, 95(5): 1–7, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/ecj.11392