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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.
Cobalt ferrite Co Fe 2 O 4 Co O · Fe 2 O 3, is in between soft and hard magnetic material and is usually classified as a semi-hard material. [23] It is mainly used for its magnetostrictive applications like sensors and actuators [24] thanks to its high saturation magnetostriction (~200 ppm). Co Fe 2 O
Ferrite nanoparticles or iron oxide nanoparticles (iron oxides in crystal structure of maghemite or magnetite) are the most explored magnetic nanoparticles up to date.Once the ferrite particles become smaller than 128 nm [22] they become superparamagnetic which prevents self agglomeration since they exhibit their magnetic behavior only when an external magnetic field is applied.
Cobalt ferrite, CoFe 2 O 4 (CoO·Fe 2 O 3), is also mainly used for its magnetostrictive applications like sensors and actuators, thanks to its high saturation magnetostriction (~200 parts per million). [7] In the absence of rare-earth elements, it is a good substitute for Terfenol-D. [8]
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Other known ferrimagnetic materials include yttrium iron garnet (YIG); cubic ferrites composed of iron oxides with other elements such as aluminum, cobalt, nickel, manganese, and zinc; and hexagonal or spinel type ferrites, including rhenium ferrite, ReFe 2 O 4, PbFe 12 O 19 and BaFe 12 O 19 and pyrrhotite, Fe 1−x S. [12]
A magnetic alloy is a combination of various metals from the periodic table such as ferrite that exhibits magnetic properties such as ferromagnetism.Typically the alloy contains one of the three main magnetic elements (which appear on the Bethe-Slater curve): iron (Fe), nickel (Ni), or cobalt (Co).
One use is in water purification: in high gradient magnetic separation, magnetite nanoparticles introduced into contaminated water will bind to the suspended particles (solids, bacteria, or plankton, for example) and settle to the bottom of the fluid, allowing the contaminants to be removed and the magnetite particles to be recycled and reused ...