<p>Data storage technologies are indispensable in the era of big data, and multiferroic materials have attracted increasing interest for electro-write magnetic-read applications owing to their fast read–write speed, low power consumption, and non-volatility enabled by magnetoelectric coupling. Among them, M-type hexagonal ferrites exhibit electric polarization and inverse magnetoelectric coupling at room temperature, making them promising candidates for multiferroic applications. However, their practical use is limited by high leakage currents, which prevent the application of high electric fields and limit polarization performance. In this study, various M-type ferrites were dispersed into multiferroic fluids to fabricate M-type ferrite-based multiferroic fluids with enhanced magnetoelectric coupling. (Ba, Sr, Pb) Fe₁₂O₁₉ multiferroic fluids were prepared using sol–gel and grinding methods, and their sedimentation stability, electrical behavior, and magnetoelectric performance were systematically investigated. The SrFe₁₂O₁₉ system exhibited the highest remanent polarization (<i>P</i>_r = 0.06 nC/cm²) and maximum polarization (<i>P</i>_max = 0.02 nC/cm²), achieving a maximum magnetoelectric coupling coefficient of 244.95&#xa0;mV/cm·Oe. Moreover, after 12&#xa0;h of sedimentation, the SrFe₁₂O₁₉ multiferroic fluid exhibited a minimal capacitance change of 0.78%, demonstrating excellent sedimentation stability. These results highlight the potential of M-type ferrite-based multiferroic fluids for advanced magnetoelectric applications.</p>