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Improving the Magnetoelectric Response of Laminates Containing High Temperature Piezopolymers

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6 Author(s)
Jon Gutierrez$^{1}$ Departamento Electricidad y Electrónica,, Universidad del País Vasco UPV/EHU,, Bilbao,, Spain ; Andoni Lasheras ; Jose Manuel Barandiaran ; Jose Luis Vilas
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High magnetoelectric (ME) coefficients at room temperature have been found when 2-2 type laminates (one magnetostrictive, the other piezoelectric) made of iron-based Metglas alloys and PVDF piezoelectric polymer are used. Searching for a good ME response of such laminate composites when used at high temperatures, we have modified both constituents: first, by using magnetostrictive Metglas 2826 MB (with λs ≈ 11 ppm) in the ribbon form thermally treated at high temperature, in order to get internal stress-relief conditions. The main consequence of such thermal treatment has been to achieve a piezomagnetic coefficient of d33=1.5×10-6/Oe, higher than the measured one in the as-cast state for this alloy. As piezoelectric constituent, we have used a new class of high temperature piezopolymer: a series of nitrile containing polyimide copolymers were fabricated with a mixture of two aromatic diamines, namely 1,3-Bis-2-cyano-3-(3-aminophenoxy)phenoxybenzene (diamine 2CN) and 1,3-Bis(3-aminophenoxy)benzene (diamine 0CN). Those diamines were in 30/70, 40/60, and 50/50 proportions within the 0CN/2CN mixture. We have measured room temperature ME coefficients up to 0.37 V/cm.Oe, being this value directly correlated to the remnant polarization of each copolyimide.

Published in:

IEEE Transactions on Magnetics  (Volume:49 ,  Issue: 1 )