I am trying to design a U core electromagnet to pluck a ferromagnetic guitar string. The strings would sit at the outside center of the U core. I am wondering if high flux cores are ok for this application or if laminated electrical steel is ok for this frequency range. I seem to have concluded that powdered metal cores are the way to go at this frequencies to have somewhat high saturation margin and balanced eddy losses. It seems however that high flux cores exhibit soft saturation. The supplied signal would probably a damped sinewave and maybe other pulse profiles. Thelectromagnet should be powerful enough to apply the equivalent force of a finger plucking a guitar string. Did not look at impedance considerations yet.