(color online) Angular dependence of voltage regulation of (a), (b) FMR fields and (c), (d) linewidths of NZFO/PMN-PT(011) heterostructures in mode 1 (the magnetic field is within the (100) plane of PMN-PT) and in mode 2 (the magnetic field is within the (011) plane of PMN-PT), respectively. The critical angles are marked with arrows.^[91]