Thin-film ferroelectrics and ferromagnets face performance limits. High leakage, low endurance, and weak scalability restrict real use. This study explores multifunctional nanoparticle integration into thin-film structures. Nanoparticles enhance charge storage, stability, and coupling. Ferroelectric response is boosted with improved polarization retention. Ferromagnetic layers show strong anisotropy and thermal durability. The hybrid films deliver high energy density with low loss. Enhanced dielectric constant and suppressed fatigue confirm stability. Coupled ferroelectric–ferromagnetic interaction allows efficient multistate operation. This dual behavior supports high-performance capacitors and logic devices. Nanoparticle doping creates uniform grain size and controlled interfaces. Such design reduces defects, leakage, and switching noise. Tailored interfaces enable flexible and miniaturized nanoelectronic circuits. The approach also ensures high scalability for large-area integration. Results show efficiency suitable for next-generation energy storage. The multifunctional films also support spintronic and memory devices. Unique novelty lies in engineered nanoparticle synergy inside thin films. This synergy brings multifunctional energy and electronic benefits. The work introduces a new platform for advanced materials. It bridges energy storage and nanoelectronics through a single system. The strategy moves beyond conventional doping or layering. It provides adaptive and high-efficiency solutions for modern technologies. Future scope lies in quantum devices, neuromorphic hardware, and IoT. Overall, the research sets a pathway for multifunctional, scalable, and energy-smart nanoelectronic materials.