What core materials are suitable for high-speed stepper motors?

[me_dexter]

I want to make a stepper Motor. How to find the suitable core material.
Can I use Annealed iron as core for stepper Motor?
Will Eddy current loss will be more in it ?
Is there any way to calculate diff core losses of diff material
https://en.m.wikipedia.org/wiki/Magnetic_core
Saw the following wiki page of magnetic core material with list

 

[Baluncore]

The stepper motor will be switching fast and so the core must respond quickly. The rectangular waves used to control stepper motors have high frequency harmonics. The core must work efficiently at those harmonic frequencies.

Your core must have thin insulated laminations or an iron or ferrite powder material in an insulating binder. The magnetic field can then travel quickly through the core insulation to reach all the magnetic material.

The problem with solid iron cores is that the speed of magnetic diffusion through conductive material is very slow, probably about one hundred metres per second. Skin effect applies in magnetic cores as well as to currents in wires.