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Deepak Rajaram Patil,이쉥차이,김준희,남중희,조정호,김병익,김기훈 한국물리학회 2017 Current Applied Physics Vol.17 No.8
With increasing demands toward device miniaturization, Pb-free magnetoelectric laminates (MELs) with a small lateral dimension of ~3 3 mm2 have been synthesized by the tape-casting method. The MELs are composed of alternating layers of magnetostrictive NiFe2O4 and piezoelectric BaTiO3 with a uniform single layer thickness of t ¼ 50 and 15 mm, respectively. Both laminates exhibit much larger longitudinal ME voltage coefficient aE33 than the transverse ME voltage coefficient aE31 at both off-resonant and resonant frequencies, which is attributed to the preferential easy-plane alignment of the magnetic moments. Furthermore, enhancement in aE33 by more than 5 times has been achieved upon decreasing t from 50 to 15 mm in both resonance and off-resonance conditions. The enhanced aE33 values indicate that nearly ideal interface coupling between the ferromagnetic and piezoelectric layers is realized in the miniaturized, thinner MEL, pointing to practical application potential towards developing massproduced, low-cost ME devices.
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