Synthesis and binder-free assembly of SrFe12O19 nano-platelets for wafer-scale patterning of magnetic components

Monolithic integration of high-frequency magnetic components such as hexaferrite circulators at the wafer scale can lead to a significant improvement in radio frequency (RF) circuit performance and functionality. However, current methods monolithically integrate films, liquid phase epitaxy, require high temperature (> 900 °C) annealing create crystalline alignment, which is not compatible with integrated process temperatures (< 350 or thick patterned films 50 ?m). In this work, we report synthesis pure phase, faceted, crystallinity [SrFe12O19] nano-platelets using direct hydrothermal approach, followed by self-assembly binder free SrFe12O19 film density isotropy. The exhibit staturation magnetization (~ 60 emu/g) coercivity (Hc) 815 Oe. dense nano-particle concentration squareness (Mr/Ms) 0.7. They be selective assembly through photoresist mask. Thicknesses up 70 ?m have been deposited on 4-in.-diamater wafers.