Best Materials for Powerful Electromagnets: Permeability & Coercivity

The core material that would make the most powerful electromagnet is one that has high magnetic permeability and low coercivity.

Magnetic permeability is a measure of how easily a material can be magnetized. The higher the permeability, the more magnetic flux a material can carry. Coercivity is a measure of how difficult it is to demagnetize a material. The lower the coercivity, the easier it is to magnetize and demagnetize a material.

The best core materials for electromagnets are those made from soft iron. Soft iron has a high permeability and low coercivity, which makes it easy to magnetize and demagnetize and allows it to carry a large amount of magnetic flux.