Abstract
We present the first data and theory for the bias magnetic field dependence of magnetoelectric coupling in the electromechanical resonance (EMR) region for ferromagnetic-piezoelectric heterostructures. Trilayers of Permendur, a alloy, and lead zirconate titanate were studied. Measurements of the magnetoelectric (ME) voltage coefficient indicate a strong ME coupling in the low-frequency range and a giant ME effect due to EMR at for radial modes and at for thickness modes. Data were obtained for the bias field dependence of two key parameters, the EMR frequency and the ME coefficient at resonance. With increasing , an increase in and a rapid rise and fall in are measured. In our model we consider two mechanisms for the magnetic field influence on ME interactions: (i) a shift in the EMR frequency due to changes in compliance coefficients ( effect) and (ii) variation in the piezomagnetic coefficient that manifests as a change in . Theoretical profiles of vs frequency and estimates of frequency shift based on the effect are in excellent agreement with the data.
- Received 28 June 2004
DOI:https://doi.org/10.1103/PhysRevB.71.184423
©2005 American Physical Society