The ability to couple two or more materials, exhibiting distinct properties, into a single geometry, such as core-shell nanocables, may lead to the realisation of novel multi -functional materials for applications such as spin valve systems. We discuss in this paper the use of supercritical fluid inclusion techniques for the growth of cobalt/magnetite and magnetite/cobalt core/shell nanocables within the pores of anodic aluminium oxide (AAO) membranes. These nanowires exhibit tunable magnetic properties which are dominated by the core material.