Magnetoelectric devices and methods of using same

Details Magnetoelectric devices and methods of using same Magnetoelectric devices and methods of using same

2007-11-20

2007-11-20

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Reciprocating

C310S311000, C318S118000

Reexamination Certificate

active

11708318

ABSTRACT:
The operational frequency of existing magnetoelectric materials having metallic or ceramic magnetostrictive materials and ceramic piezoelectric materials may be limited to a few kilohertz due to the presence of eddy-current losses in the metallic magnetostrictive phase. Further, these materials may be difficult to machine and fabricate due to their brittleness. Additionally, it may be difficult to tailor and optimize the properties (i.e., magnetoelectric voltage coefficient αE, etc.) of the devices. This invention provides a magnetoelectric element including at least one set of alternating piezoelectric layers and magnetostrictive composite layers. The magnetostrictive composite layer includes at least one magnetostrictive material dispersed in first concentrated zones within a first polymer matrix, wherein all of the concentrated zones are orientated along a first direction. It is found that the conversion efficiency (i.e., αE) varies in accordance with applied magnetic control field Hcontrol.

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J. Van Den Boomgaard et al., A sintered magnetoelectric composite material BaTiO3-Ni(Co,Mn) FE2O4, Journal of Materials Science 13 (1978), Chapman and Hall ltd., printed in Great Britain pp. 1538-1548.

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