The more electric engine concept is a world wide initiative looking to change the way electrical power is produced within a gas turbine. This design change will lead to a reduction in platform weight, a reduction in machine complexity and improved performance. One of the key components to implementing this design change is a high temperature electrical motor / generator mounted co-axially inside the engine core. This so called integrated starter generator (ISG) will operate at high temperatures and stresses, which places demands on the magnetic materials used to construct the motor. In terms of magnetic performance, FeCo alloys appear to be prime materials for this application. They offer high magnetic saturation, high curie temperatures and low magnetic losses. The main problem with these materials is that they lack the mechanical strength necessary for use in high temperature rotating applications. This paper summarises work to produce a high strength metal matrix composite (MMC) FeCo system. Technology based on reinforcing titanium alloys with SiC fibres has been developed and adapted. The FeCo matrix is considerably more reactive than titanium systems and therefore barrier layer coatings on the fibre have been developed to control the fibre-matrix reactions. The composite material has excellent mechanical properties, in particular creep and low cycle fatigue at temperatures up-to 500°C.