Question

Why iron, cobalt and nickel are only magnetic materials?

Answer 1

Answer:

Iron, Cobalt, Nickel, Neodymium are ferromagnetic substances. These substances are special in the sense; first of all they have unpaired electrons in the valence orbital which act as magnetic dipoles. These substances with unpaired electrons are called paramagnetic substances

Answer 2

Exactly in the four elements iron, nickel, cobalt and gadolinium, there is interaction between so-called 'unpaired spins'. This interaction ensures that the magnetic moments of atoms can permanently align parallel to each other. The sum of all these small magnetizations forms the nett magnetization of the material.