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.

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

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.
Therefore, the magnetic behaviour of bulk impact layer sample can not be explained by dissolution of Fe-O magnetic microspherules within a less magnetic matrix, but a high abundance of fine ferrimagnetic material dispersed within the matrix has to be present.
Although the initial magnetic susceptibility and SIRMs are first-order measures of the amount of ferrimagnetic material in the sample, the scatter plot does not seem to clearly discriminate between the three stylistic groups identified in Dos Mosquises.
We argue that NRMs better discriminate between different stylistic-groups, due perhaps to the fact that they are not only sensitive to concentration of ferrimagnetic materials, but also to grain size distribution, kind of magnetic minerals and intensity of the geomagnetic field at the time the pottery was fired (i.
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.
If it is assumed that significant proportions of ferrimagnetic material in the surface soils in this study resulted from fire enhancement, what accounts for our findings that the reverse is true?
Calculation of losses in ferro- and ferrimagnetic materials based on the modified Steinmetz equation.
de Donker, "Calculation of losses in ferro and ferrimagnetic materials based on the modified Steinmetz equation", IEEE Trans.
Magneto-optical Kerr microscope for determination of magnetic domains in ferromagnetic and ferrimagnetic materials.
Ferro-magnetic and ferrimagnetic materials may have spin resonances in microwave to millimeter wave frequencies (120).
The magnetic properties of materials are listed and aspects of the electromagnetic field inside ferrimagnetic materials are presented.