Amorphous magnet

Schematic representation of a crystalline ferromagnetic phase (top) and a disordered phase of an amorphous magnet (bottom)

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.[1] 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.[2] Due to random frustration, amorphous magnets possess many nearly degenerate ground states.[1]

The terms for the amorphous magnetic phases were coined by Michael Coey in 1970s.[2][3][4] The Greek root spero/speri (Greek: διασπειρω, romanized: diaspeiro) means 'to scatter'.[1][4][a]

  1. ^ a b c Coey, J. M. D. (2010-03-25). Magnetism and Magnetic Materials. Cambridge University Press. ISBN 978-1-139-48692-7.
  2. ^ a b Kaneyoshi, Takahito (2018-01-18). Amorphous Magnetism. CRC Press. ISBN 978-1-351-07806-1.
  3. ^ Memoir. The Society. 1963. ISBN 978-81-85867-05-2.
  4. ^ a b c Coey, J. M. D. (1978-03-01). "Amorphous magnetic order". Journal of Applied Physics. 49 (3): 1646–1652. Bibcode:1978JAP....49.1646C. doi:10.1063/1.324880. ISSN 0021-8979.


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