Cobalt, Nickel, and Iron, all are magnetic but which is best?

Question

If I were to build a electromagnet with a core of either Cobalt, Nickel or Iron, assuming all other verriables were left unchanged, which magnet is going to be the strongest?

Answer 1

If you're using pure materials than iron is the strongest, followed by nickel. But steel (iron with a small percentage of carbon) and nickel-iron alloys do far better.   The winner is an alloy called supermalloy, composed of Ni (79%), Mo (5%), and Fe(16%) .