Electrodeposition was demonstrated to be useful for the preparation of copper-magnetite magnetic composites. An acidic bath was tested for the incorporation of nanometric magnetite (Fe3O4) particles into an electrodeposited copper matrix. Cationic surfactant (dodecyltrimethylammonium chloride-DTAC) was used to keep particles suspended in the electrolyte as well as to assist magnetite incorporation. The influence of several parameters (bath temperature, deposition technique, stirring regimes and deposition conditions) on composites composition was analysed. Low stirring rate, moderate temperature (15 degrees C) and an applied magnetic field provided a greater incorporation of magnetite. Field emission scanning electron microscopy revealed magnetite distribution through the deposit thickness. Electrodeposited composites showed ferromagnetic behaviour. Magnetic force microscopy showed a magnetic response for the composites.