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"Soft" ferrites have low coercivity, so they easily change their magnetization and act as conductors of magnetic fields. They are used in the electronics industry to make efficient magnetic cores called ferrite cores for high-frequency inductors , transformers and antennas , and in various microwave components.
Barium ferrite has been considered for long term data storage. The material has proven to be resistant to a number of different environmental stresses, including humidity and corrosion. Because ferrites are already oxidized it can not be oxidized any further. This is one reason ferrites are so resistant to corrosion. [9]
The most common soft ferrites are: Manganese-zinc ferrite (MnZn, with the formula Mn a Zn (1−a) Fe 2 O 4). MnZn have higher permeability and saturation levels than NiZn. Nickel-zinc ferrite (NiZn, with the formula Ni a Zn (1−a) Fe 2 O 4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies ...
These uses take advantage of the redox reactions occurring at the surface of the ferrite. Cobalt ferrite prepared with controlled morphology and size to enhance the surface area, and thus the number of active sites, has been published. [9] One disadvantage of the cobalt ferrite for some applications is their low electrical conductivity.
Hexagonal ferrites or hexaferrites are a family of ferrites with hexagonal crystal structure. The most common member is BaFe 12 O 19 , also called barium ferrite , BaM, etc. BaM is a strong room-temperature ferrimagnetic material with high anisotropy along the c axis. [ 1 ]
Bismuth ferrite melts incongruently, but it can be grown from a bismuth oxide rich flux (e.g. a 4:1:1 mixture of Bi 2 O 3, Fe 2 O 3 and B 2 O 3 at approximately 750-800 Celsius). [2] High quality single crystals have been important for studying the ferroelectric, antiferromagnetic and magnetoelectric properties of bismuth ferrite.
Zinc ferrites are a series of synthetic inorganic compounds of zinc and iron with the general formula of Zn x Fe 3−x O 4. Zinc ferrite compounds can be prepared by aging solutions of Zn(NO 3 ) 2 , Fe(NO 3 ) 3 , and triethanolamine in the presence and in the absence of hydrazine , [ 1 ] or reacting iron oxides and zinc oxide at high temperature.
Yttrium iron garnet (YIG) is a kind of synthetic garnet, with chemical composition Y 3 Fe 2 (FeO 4) 3, or Y 3 Fe 5 O 12.It is a ferrimagnetic material [1] with a Curie temperature of 560 K. [2]