Converse magneto-electric coefficient of concentric multiferroic composite ring

Abstract

The converse magnetoelectric (CME) coefficient of an artificial, multiferroic composite cylinder was determined for two interface boundary conditions; specifically epoxy-bonded and shrink-fit. The composite consists of two concentrically bonded rings with the inner and outer rings made from Terfenol-D and lead zirconate titanate, respectively. The diameter of the inner annulus was 25 mm, and the outer ring diameter was 30 mm. Electric fields ranging from 20 kV/m to 80 kV/m with AC components cycling at frequencies from 4 kHz to 50 kHz were applied for actuation of the composite. A magnetic bias field from 0 Oe to 2300 Oe was applied for enhancement of the CME coefficient. It has been found that the maximum CME for epoxy-bonded rings occurs at lower bias magnetic field than shrink-fitted rings. Resonance for the epoxy-bonded composite was found to be 36 kHz whereas the resonant frequency for the shrink-fit structure was 34 kHz. The maximum CME coefficients were approximately 535 mG/V at 100 Vpp and 330 mG/V at 400 Vpp for the epoxy-bonded and shrink-fit configurations, respectively.

Noncontact spatiotemporal strain mapping of composite multiferroic cylinders

“…Analytical models predict the concentric cylinder geometry to exhibit a giant magnetoelectric response due to the curvature enhancing the strain transfer between material layers (Wang et al 2010a). Our group has extensively studied the CME response of the concentric cylinder structure using experimental, analytical, and computational analyses (Newacheck et al 2018;Chavez et al 2016;Youssef et al 2020a). Specifically, we have experimentally investigated the effect of the bias magnetic field direction, electric field direction, and bonding methods, while analytically explored the effect of mechanical boundary conditions, and developed validated computational models (Newacheck et al 2018;Chavez et al 2016;Youssef et al 2020a, b).…”

“…Our group has extensively studied the CME response of the concentric cylinder structure using experimental, analytical, and computational analyses (Newacheck et al 2018;Chavez et al 2016;Youssef et al 2020a). Specifically, we have experimentally investigated the effect of the bias magnetic field direction, electric field direction, and bonding methods, while analytically explored the effect of mechanical boundary conditions, and developed validated computational models (Newacheck et al 2018;Chavez et al 2016;Youssef et al 2020a, b). In the previous efforts, not only we investigated and reported the overall response, i.e., the converse magnetoelectric coefficient, but also, we thoroughly studied the behavior of each of the constituents such as the direction of polarization of the piezoelectric cylinder (Youssef et al 2017a) as well as the magnetostriction response of Terfenol-D (Youssef et al 2017b).…”

Modeling of a Magnetoelectric Laminate Ring Using Generalized Hamilton’s Principle

“…Next, a perfect bonding between the layers was assumed, implying that the strain of the magnetostrictive materials transferred to the piezoelectric material without loss. In fact, the unpredictable stress and strain introduced by the elasticity and viscosity of the bonding materials may have decreased the strain transfer efficiency and significantly affected the errors between the model and experiment [14,15,16]. Subsequently, an axisymmetric deformation was assumed in the theory where only the normal strain was considered and the shear strain was neglected.…”

“…Particularly, laminated composites made of magnetostrictive and piezoelectric materials have been emphasized [10,11,12,13]. The ME effects of rectangular laminate, disk–ring, and layered ring–ring composite structures have been studied analytically and experimentally [10,11,12,13,14,15,16,17]. Owing to the strong product effect of the magnetoelastic and elastoelectric effects, they possess large ME effects.…”

Edge geometry effects on resonance response of electroplated cylindrical Ni/PZT/Ni magnetoelectric composites

“…8 Chavez et al compared the CME coefficient between shrink fitted and epoxy bonded multiferroic cylinder composite structures. 9 Pan et al analyzed the performance of various electroplated Ni layered geometries, including trilayered plate, bilayered and trilayered cylinder structures. However, little information can be found about the effect of edges created when the ME composite is fabricated using electrodeposition.…”