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Published December 2010 | public
Journal Article

Optimization of magnetoelectricity in piezoelectric–magnetostrictive bilayers


Magnetoelectric coupling is of interest for a variety of applications, but is weak in monolithic materials. Strain-coupled bilayers or multilayers of piezoelectric and magnetostrictive material are an attractive way of obtaining enhanced effective magnetoelectricity. This paper studies the optimization of magnetoelectricity with respect to the crystallographic orientations and the relative thickness of the two materials. We show that the effective transverse (α_(E, 31)) and longitudinal (α_(E, 33)) coupling constants can be enhanced many-fold at the optimal orientation compared to those at normal orientation. For example, we show that the constants are 17 and 7 times larger for the optimal orientation of a lithium niobate/Terfenol-D bilayer of equal thickness compared to the normal orientation. The coupling also increases as the piezoelectric phase gets thinner.

Additional Information

© 2010 IOP Publishing Ltd. Received 10 May 2010, in final form 25 August 2010. Published 1 November 2010. We gratefully acknowledge the financial support of the National Science Council, Taiwan (Taiwan Merit Scholarship to H-YK, 95-2211-E006-334-MY2), Caltech's SURF program (AS) and the US Army Research Office (AS and KB, W911NF-07-1-0410).

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