Voltage-Controlled Ferromagnetic Resonance of Dipole-Coupled Co40Fe40B20 Nanoellipses

Software-defined radio (SDR) requires multi-use or reconfigurable radio-frequency front ends, with filters capable of dynamically shifting their operating frequencies. Current approaches to tunable filters typically require prohibitively large electric fields to achieve large tuning. This study utilizes a multiferroic approach, with an electric field straining magnetoelastic elements to tune the system's magnetic resonance. Furthermore, dipole coupling of the elements yields mode splitting, for additional resonance peaks that depend on element spacing and applied strain. This could lead to innovative types of rf filters for SDR, where communication frequencies are rapidly changing.