Ferrimagnetic Material

ferrimagnetic material

[‚fe·ri·mag′ned·ik mə′tir·ē·əl]
(solid-state physics)
A material displaying ferrimagnetism; the ferrites are the principal example. Also known as ferrimagnet.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ferrimagnetic Material

 

any of the materials in which the magnetic moments of ions are ferrimagnetically ordered at temperatures below the Curie point. Most ferrimagnetic materials are ionic crystals containing magnetic ions of various elements or of a single element. The ions either have different valences or else occupy different crystallographic sites.

Of the ferrimagnetic materials that have been thoroughly studied, ferrites constitute the broadest class. Hexagonal ternary fluorides (RbNiF3, CsNiF3, TlNiF3, CsFeF3) make up an important group of ferrimagnetic crystals; these substances are of particular interest because of their transparency in the optical region of the spectrum. Ferrimagnetic materials also include a number of alloys and intermetallic compounds. In most cases, these materials contain atoms of the rare-earth elements. Of particular interest are compounds of the type RMe5, where R denotes a rare-earth ion and Me is an ion of the iron triad; an example is provided by GdCo5.

Ferrimagnetic materials are used in radio engineering as cores for high-frequency circuits and in microwave engineering as non-reciprocal components. They serve as memory components in computers, and they are also used in making permanent magnets.

A. S. BOROVIK-ROMANOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Kim, "Suppression of leakage magnetic field from a wireless power transfer system using ferrimagnetic material and metallic shielding," in Proceedings of the IEEE International Symposium on Electromagnetic Compatibility (EMC '12), pp.
The filler particles consist of magnetite, a ferrimagnetic material. The solid silicone rubber thus lends itself to the manufacture of magnetizable molded parts and profiles that, after magnetization, act like weak permanent magnets.
The fact that there are no VM particles in size 4 (250-500 [micro]m) suggests that the processes causing formation of ferrimagnetic material are biased toward larger particle sizes.
The filler particles consist of magnetite, a ferrimagnetic material. The new solid silicone rubber thus lends itself to the manufacture of magnetizable molded parts and profiles that, after magnetization, act like weak permanent magnets.
Calculation of losses in ferro- and ferrimagnetic materials based on the modified Steinmetz equation.
Magnetite ([Fe.sub.3][O.sub.4]) is the ferrimagnetic materials and we can expect the appearance of magnetic properties for these glasses, but for production of porous magnetic glasses it is necessary to have the two-phase structure of glasses consisting of interpenetrative silica skeleton and chemically unstable phase, which can be removed at chemical etching of two-phase glasses [5].
de Donker, "Calculation of losses in ferro and ferrimagnetic materials based on the modified Steinmetz equation", IEEE Trans.
Large multidomain ferro- or ferrimagnetic materials contain several subdomains each having their own specific magnetization direction.