The magnet consists of two sections, one of "hard" high coercivity material and one of "soft" (low coercivity) material; in the latter piece the direction of magnetization can be switched by a pulse of current in a wire winding.
The magnet consists of two sections of "hard". High coercivity material can be switched by a pulse of current in a wire. One of "soft" (low coercivity) material; in the latter piece the direction of magnetization can be switched by a pulse of current in a wire. This wire is winding hard. Two sections are one.