In physics, amorphous magnet refers to a magnet made from amorphous solids. Below a certain temperature, these magnets present permanent magnetic phases produced by randomly located magnetic moments. Three common types of amorphous magnetic phases are asperomagnetism, speromagnetism and sperimagnetism, which correspond to ferromagnetism, antiferromagnetism and ferrimagnetism, respectively, of crystalline solids. Spin glass models can present these amorphous types of magnetism. Due to random frustration, amorphous magnets possess many nearly degenerate ground states.
The terms for the amorphous magnetic phases were coined by Michael Coey in 1970s. The Greek root spero/speri () means to scatter.