Magnetic properties of Fe arborescences grown by electrodeposition
Résumé
Magnetization measurements were performed on Fe arborescent aggregates grown by electrodeposition. ‘Sparse' arborescences with few thick branches and ‘dense' arborescences with many thin branches can be generated. A change in the magnetic behavior is observed in connection with these morphologies. Sparse arborescences show a soft magnetism not too different from that of bulk Fe. Dense arborescences show a behavior akin to that of ‘fine grains': a remanent magnetization about half of the saturation and a coercive field of about 0.1 T are measured at low temperature. On increasing the temperature, a superparamagnetic contribution is detected up to room temperature.