A proton has spin and magnetic moment just like an electron. Why then its effect is neglected in magnetism of materials?

The magnetic moment has midensions of :

What is the magnetic moment of an electron due to its orbital motion?

The maximum magnetic moment is shown by the ion with electronic configuration of

A steel wire of length l has a magnetic moment M. It is then bent into semicircular arc. What is the new magnetic moment?

The magnetic moment (spin only) of [NiCl_4]^(2-) is

What type of magnetic material is used in making electromagnets and why ?