Soft magnetic materials are defined by high magnetic saturation and low coercivity; however, for soft magnetic composites, low hysteresis and eddy current losses are significant. Pushing curing temperature limits to properly stress relieve the ferromagnetic powder and maintain the insulating layer is only feasible with inorganic, thermally stable coatings. Soft ferrites allow for complete isolation of individual Fe particles, curing temperatures above 700oC, and minimal reduction in magnetic performance. This work compares three types of ferrites (NiZn-, MnZn-, and Fe-Fe2O4) applied via milling, compacting, and curing between 700 – 1000oC. The coating thickness and uniformity are explored via SEM, while grain structure with respect to temperature are determined via EBSD. Each coating material has different magnetic saturation and resistivity which will control hysteresis and eddy current losses, respectively. This work explores the coating-core interface via TEM/EELS for diffusion of oxygen along the particle boundaries and phase dependence on resistivity.