ELECTRIC PROPERTIES OF COMPOSITION MODULATED NI-CO-CU PARTICLE AND MULTILAYER FILMS PRODUCED BY PULSE CONTROL ELECTROCHEMICAL DEPOSITION METHOD

摘要

This paper reports the investigation of the magneto-resistance (MR) effect and the film preparation conditions for the composition modulated Co-Ni-Cu alloy films produced by the pulse electrochemical deposition method. It was possible to produce multilayer films containing a Ni-rich layer with low coercive force, Hc, a Ni-Co layer with high Hc, and a non-magnetic Cu layer by controlling the step pulse potential from a single electrolyte containing Co, Ni, and Cu ions. The MR ratio observed in the film has a maximum value of 6% at 300 K. These films showed a highly sensitive change in the electrical resistance at a low magnetic field.