Ferromagnetism is the basic mechanism bi which certain materials (such as airn) form permanent magnets, or are attractit tae magnets. In pheesics, several different types o magnetism are distinguished. Ferromagnetism (includin ferrimagnetism) is the strangest type; it is the anly type that creates forces strang enough tae be felt, an is responsible for the common phenomena of magnetism encoontered in everyday life. Ither substances respond weakly tae magnetic fields wi twa ither types o magnetism, paramagnetism an diamagnetism, but the forces are so weak that thay can anly be detectit bi sensitive instruments in a laboratory. An everyday example o ferromagnetism is a refrigerator magnet uised tae hauld notes on a refrigerator duir. The attraction atween a magnet an ferromagnetic material is "the quality o magnetism first apparent tae the auncient warld, an tae us the day".