Strong magnets with a high energy product are vital when optimizing the efficiency in the electricindustry. This can be achieved by making spring-exchange coupled magnets. Samples have beenmade by partly reducing CoFe2O4 to CoFe2 creating easily a spring-exchange coupled magnetswith 10 times increase in energy product compared to pure CoFe2O4. The spring-exchange is amicroscopic short ranged effect in which the spins in the soft phase gets aligned by the field fromthe hard phase. The coupling increases the atomic magnetic moments which enhances the energy product. However, the coupling breaks down at low temperature so we propose to do temperature scans while collecting powder diffraction data in order to investigate the spring-exchange couple mechanism on an atomic level.