- Type of permanent magnetism that occurs in solids, in which the magnetic fields associated with individual atoms spontaneously align themselves, some parallel (as in ferromagnetism), and others antiparallel, or paired off in opposite directions (as in antiferromagnetism).The materials are less magnetic than ferromagnets, as the antiparallel atoms dilute the magnetic effect of the parallel arrangement. Ferrimagnetism occurs mainly in magnetic oxides known as ferrites. Above a temperature called the Curie point, the spontaneous alignment is disrupted and ferrimagnetism is destroyed, but it is restored upon cooling below the Curie point.
* * *▪ physicstype of permanent magnetism that occurs in solids in which the magnetic fields associated with individual atoms spontaneously align themselves, some parallel, or in the same direction (as in ferromagnetism), and others generally antiparallel, or paired off in opposite directions (as in antiferromagnetism). The magnetic behaviour of single crystals of ferrimagnetic materials may be attributed to the parallel alignment; the diluting effect of those atoms in the antiparallel arrangement keeps the magnetic strength of these materials generally less than that of purely ferromagnetic solids such as metallic iron.Ferrimagnetism occurs chiefly in magnetic oxides known as ferrites (ferrite). The natural magnetism exhibited by lodestones, recorded as early as the 6th century BC, is that of a ferrite, the mineral magnetite, a compound containing negative oxygen ions O2- and positive iron ions in two states, iron(II) ions, Fe2+, and iron(III) ions, Fe3+. The oxygen ions are not magnetic, but both iron ions are. In magnetite crystals, chemically formulated as Fe3O4, for every four oxygen ions, there are two iron(III) ions and one iron(II) ion. The iron(III) ions are paired off in opposite directions, producing no external magnetic field, but the iron(II) ions are all aligned in the same direction, accounting for the external magnetism.The spontaneous alignment that produces ferrimagnetism is entirely disrupted above a temperature called the Curie point (q.v.), characteristic of each ferrimagnetic material. When the temperature of the material is brought below the Curie point, ferrimagnetism revives.
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Ferrimagnetism — In physics, a ferrimagnetic material is one in which the magnetic moment of the atoms on different sublattices are opposed, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous… … Wikipedia
ferrimagnetism — ferimagnetizmas statusas T sritis fizika atitikmenys: angl. ferrimagnetism vok. Ferrimagnetismus, m rus. ферримагнетизм, m pranc. ferrimagnétisme, m … Fizikos terminų žodynas
ferrimagnetism — noun see ferrimagnetic … New Collegiate Dictionary
ferrimagnetism — noun a form of antiferromagnetism in which some magnetization remains below a critical temperature (the Neel temperature) … Wiktionary
ferrimagnetism — Смотри Ферримагнетизм … Энциклопедический словарь по металлургии
ferrimagnetism — permanent and large magnetizations found in some ceramic materials; it results from antiparallel spin coupling and incomplete magnetic moment cancellation … Mechanics glossary
ferrimagnetism — fer·ri·magnetism … English syllables
ferrimagnetism — n. Physics a form of ferromagnetism with non parallel alignment of neighbouring atoms or ions. Derivatives: ferrimagnetic adj. Etymology: F ferrimagneacutetisme (as FERRI , MAGNETISM) … Useful english dictionary
Ферримагнетизм — [ferrimagnetism] магнитное состояние вещества, при котором элементарные магнитные моменты ионов, входящие в состав вещества (ферастворимагнетика), образуют две или большее число подсистем магнитных подрешеток. Каждая из подрешеток содержит ионы… … Энциклопедический словарь по металлургии
Ferromagnetism — Not to be confused with Ferrimagnetism; for an overview see Magnetism A magnet made of alnico, an iron alloy. Ferromagnetism is the physical theory which explains how materials become magnets. Ferromagnetism is the basic mechanism by which… … Wikipedia