Exchange-coupling enhanced: Tailoring structural and magnetic properties of Dy iron garnet ferrite nanoparticles via La substitution for switching devices

Nano particles with controlled oxygen vacancy, lower coercivity, and stronger magnetic saturation offer potential for innovative advances in miniaturized switching devices. In this research we aimed to investigate the impact of lanthanum (La³⁺) ion substitution on structural, morphological, magnetic, and switching properties of dysprosium iron garnet ferrite (DyIG). Selected area electron diffraction and high-resolution TEM images indicated more distinct patterns and continuous rings in La-substituted samples, suggesting improved structural characteristics. X-ray photoelectron spectroscopy analysis evidenced successful La ion substitution with controlled oxygen ions vacancies. La-substituted nano-particles exhibited lower coercivity, higher magnetic saturation, and a higher squareness ratio as compared to pure DyIG, implying improved magnetic behaviour and enhanced switching traits. Switching field distribution curve analysis further supported magnetization reversal and exchange coupling presence. The findings suggest that the introduction of La ions in DyIG nanoparticles holds promise for advanced applications in hyperthermia cancer treatment, miniaturized and high-frequency switching devices.