Ferrimagnetism

Common card · No. 363493

A ferrimagnetic material is a material that has populations of atoms with opposing magnetic moments, as in antiferromagnetism, but these moments are unequal in magnitude, so a spontaneous magnetization remains. This can, for example, occur when the populations consist of different atoms or ions (such as Fe2+ and Fe3+). In addition , ferrimagnets can be compensated Néel-ordered magnets, i.e. with equal in magnitude and antialigned spins as in antiferromagnetism, but characterized by a lack of symmetry connecting their magnetic sublattices. Like ferromagnetic substances, ferrimagnetic substances are attracted by magnets and can be magnetized to make permanent magnets. The oldest known magnetic substance, magnetite (Fe3O4), is ferrimagnetic, but was classified as a ferromagnet before Louis Néel discovered ferrimagnetism in 1948. Since the discovery, numerous uses have been found for ferrimagnetic materials, such as hard-drive platters and biomedical applications. When the material is amorphous...

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