(color online) (a) The FMR spectra and (b) tunability of FMR fields and the effective linewidth of CoZr (20 nm)/PMN-PT(011) heterostructures under various applied voltages at a fixed frequency of 8.969 GHz. (c) The FMR spectra of CoZr (20 nm)/Ta (5 nm)/PMN-PT(011) multilayers at different applied voltages. The inset represents a symmetric spectrum of the CoZr/Si structures.^[63]