Enhanced resonant magnetoelectric coupling in frequency-tunable composite multiferroic bimorph structures

Abstract

). Finkel, P.; Bonini, J.; Garrity, E.; et al., "Enhanced resonant magnetoelectric coupling in frequency-tunable composite multiferroic bimorph structures," Appl. Phys. Lett. 98, 092905 (2011); http://dx

Stress reconfigurable tunable magnetoelectric resonators as magnetic sensors

“…[15][16][17] For example, Finkel et al achieved a full octave of tuning capability by utilizing a uni-axial stress tuning approach in double-clamped ME structures. 18 As will be seen, the magnetic field frequency dependence of tunable resonators can be used for near-DC magnetic field sensing.…”

“…However, the benefit of noise rejection at higher resonance frequencies is offset by the reduction in a ME and a resultant loss of sensor sensitivity at higher stress levels. 18 Therefore, high resonance frequencies are more efficiently achieved by decreasing sensor dimensions, rather than applying high levels of stress.…”

“…A strip of Metglas (Fe 74.4 Co 21.6 Si 0.5 B 3.3 Mn 0.1 C 0.1 ) (50 Â 5 Â 0.025 mm) is clamped at each end and is excited using a PZT element in a custom designed sample loading fixture (Figure 1(a)). 18 This sample holder is positioned in a Helmholtz coil, which provides a magnetic field bias (H dc ) up to 120 Oe. The magnetic field is oriented parallel to the long axis of the sample, which provides the greatest magnetostrictive response.…”

Giant resonant magnetoelectric effect in bi-layered Metglas/Pb(Zr,Ti)O3 composites

“…In order to apply the resonant ME effect at various frequencies, some approaches have been studied to tune the resonant frequency of ME composites. [8][9][10] In the prior investigations, however, the restrictive experimental conditions were required in these researches, such as double-side clamped edges. Otherwise, the resonant ME coefficients were not impressive which limit the performances of devices as well.…”

Mechanical loss and magnetoelectric response in magnetostrictive/interdigitated-electrode/piezoelectric laminated resonators

“…The Q of ME laminates is determined by the composite components, 7 the polarization distribution of the piezoelectric core, 8 and the boundary conditions. 9 Thus, with regards to modulation technique applications, it is important to characterize the effective mechanical quality factor Q eff of the multi-push-pull mode laminates and the dependence of the polarization distribution that results from the geometry of the ID-electrodes.…”