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Title: Magnetic field-induced strain and magnetoelectric effects in sandwich composite of ferromagnetic shape memory Ni-Mn-Ga crystal and piezoelectric PVDF polymer
Authors: Zeng, Min
Or, Derek Siu-wing
Chan, Helen L. W.
Subjects: Composite materials
Ferromagnetic materials
Gallium alloys
Magnetoelastic effects
Magnetoelectric effects
Manganese alloys
Martensitic structure
Nickel alloys
Piezoelectric materials
Piezoelectric thin films
Polymer films
Sandwich structures
Shape memory effects
Twin boundaries
Issue Date: Oct-2010
Publisher: IEEE
Source: IEEE transactions on ultrasonics, ferroelectrics, and frequency control, Oct. 2010, v. 57, no, 10, p. 2147-2153.
Abstract: A sandwich composite consisting of one layer of ferromagnetic shape memory Ni-Mn-Ga crystal plate bonded between two layers of piezoelectric PVDF polymer film was fabricated, and its magnetic field-induced strain (MFIS) and magnetoelectric (ME) effects were investigated, together with a monolithic Ni-Mn-Ga crystal, as functions of magnetic fields and mechanical load. The load-free dc- and ac-MFISs were 0.35 and 0.05% in the composite, and 5.6 and 0.3% in the monolithic crystal, respectively. The relatively smaller load-free MFISs in the composite than the monolithic crystal resulted from the clamping of martensitic twin-boundary motion in the Ni-Mn-Ga plate by the PVDF films. The largest ME coefficient (αE) was 0.58 V/cm·Oe at a magnetic bias field (H[sub Bias]) of 8.35 kOe under load-free condition. The mechanism of the ME effect originated from the mechanically mediated MFIS effect in the Ni-Mn-Ga plate and piezoelectric effect in the PVDF films. The measured αE–H[sub Bias] responses under different loads showed good agreement with the model prediction.
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Type: Journal/Magazine Article
DOI: 10.1109/TUFFC.2010.1671
ISSN: 0885-3010
Appears in Collections:AP Journal/Magazine Articles
EE Journal/Magazine Articles

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