Magnetic wires have become very popular in the last decade because the can be used for several applications, and especially as core of orthogonal fluxgate sensors [1-2]. In this field it is very important to have a magnetic wire which fits the requirements not only in terms of permeability but also which has a BH loop with specific shape. In this paper we show how we can effectively change the BH loop of an amorphous wire by annealing it under the effect of a current.