SOFT-HARD MAGNETIC COMPOSITE WIRES OBTAINED BY A MODIFIED CURRENT ANNEALING TECHNIQUE

A current annealing procedure is proposed. Heat sinks were positioned along the sample, while annealing with current, inducing tailored temp erature profile along its axis. Fe77.5Si7.5B15 amorphous wires were cu rrent annealed with this technique so that, magnetically soft and hard local regions develop. As a measure of this magnetic composite charac ter, the coercivity profile was verified after annealing. Results are explained in terms of different power losses along the sample. Some po ssible applications as security labels of the annealed material are di scussed. (C) 1997 American Institute of Physics.