Effects of geometric size and mechanical boundary conditions on magnetoelectric coupling in multiferroic composites

Abstract

A three-dimensional finite element method program is developed to investigate the magnetoelectric (ME) coupling in multiferroic composites. For a bilayer plate, we show that: (1) the electric potential in the piezoelectric layer induced by the magnetic potential is not uniform but exhibits concentration near the edge/corner of the plate; (2) the mechanically clamped boundary condition can enhance the ME effect by a factor of 10 as compared with the traction-free case; (3) the ME effect in a composite plate is always stronger than that in the corresponding composite beam; (4) a large aspect ratio of the plate corresponds to an increased ME effect; (5) the in-plane longitudinal ME effect is larger than the out-of-plane one.

Large multiple resonance of magnetoelectric effect in a multiferroic composite cylinder with an imperfect interface

“…(ii) For the perfect interface l ¼ 0, the ME effect for the C-C MBC is always larger than that for the other three MBCs. Such phenomenon agrees well with previous experimental and analytical reports [7,18]. (iii) As l increases, the ME effect under the C-C MBC experiences a sharp decrease.…”

“…Studies on multiferroic nanocomposites were further carried out [16,17]. Several practical and efficient ways were proposed to enhance the ME effect, for instance, by changing the geometric parameter and mechanical conditions [18], using the resonance driving frequency [19], employing the functionally graded materials [20], altering the polarization direction [21], and by applying different magnetic bias field [22]. …”

Magnetoelectric effects in bilayer multiferroic core-shell composites

“…For C-C MBCs, the ME effect for both spherical and cylindrical multiferroic composites approaches 0.95(V/m)(A/m) −1 . This value agrees very well with that reported by Pan and Wang (the ME effect is measured as 0.95(V/m)(A/m) −1 for V f = 0.5 from Figure 3 by the finite element method [14]. We next consider the ME effect in the bilayer multiferroic core-shell composites around the electromechanical resonance frequencies.…”

“…The laminated multiferroic plates are common configuration and easy to be fabricated. Up to now, many theoretical and experimental investigations were carried out at both low-frequency and electromechanical resonance ranges [4][5][6][7][8][9][10][11][12][13][14].…”

Nonlinear magneto-electric response of a giant magnetostrictive/piezoelectric composite cylinder

“…The mechanical behaviors and ME effect of layered ME composites have been extensively studied [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Harshe et al [4] proposed a model for ME coupling in a bilayer of magnetostrictive and piezoelectric phases, based on their model, they obtained the longitudinal ME coefficient for CFO-PZT layered composites; meanwhile, they conducted some experiments to verify their theoretical prediction.…”