. . . "0"^^ . "110739786"@en-us . . "111480284"^^ . "11480284-n"^^ . . "0"^^ . . . "phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed"@en-us . . . "ferromagnetism"^^ . . "ferromagnetism"@en-us .