The voltage control of spin and charge degrees of freedom in complex materials is a cornerstone for the realization of advanced electronic devices with enhanced functionalities. Here, we demonstrate in situ indirect current control via the Joule effect of the spin resonance parameters in a phase-separated La5/8−yPryCa3/8MnO3 sample while simultaneously inducing resistive switching. By employing electron paramagnetic resonance (EPR) spectroscopy under an applied bias voltage, we observe sharp, reversible modifications in the EPR spectra—linewidth, resonance field, and intensity—concurrent with voltage-driven transitions between the ferromagnetic metallic (FMM) and paramagnetic charge-ordered (PM-CO) states. This real-time probing of spin resonance during resistive switching provides crucial insights into the interplay between spin, charge, and lattice degrees of freedom, elucidating the distinct roles of the FMM and PM-CO phases in the observed behavior. These findings pave the way for the development of novel spintronic and neuromorphic devices with voltage-tunable functionalities.
