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  2. Magnetite - Wikipedia

    en.wikipedia.org/wiki/Magnetite

    Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe 2+ Fe 3+ 2 O 4. ... resulting in a highly porous high-surface-area material, which ...

  3. Magnet - Wikipedia

    en.wikipedia.org/wiki/Magnet

    A magnet is a material or object that produces a magnetic field.This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets.

  4. Lodestone - Wikipedia

    en.wikipedia.org/wiki/Lodestone

    The Earth's magnetic field at 0.5 gauss is too weak to magnetize a lodestone by itself. [9] [10] The leading theory is that lodestones are magnetized by the strong magnetic fields surrounding lightning bolts. [9] [10] [11] This is supported by the observation that they are mostly found near the surface of the Earth, rather than buried at great ...

  5. Permeability (electromagnetism) - Wikipedia

    en.wikipedia.org/wiki/Permeability...

    A useful tool for dealing with high frequency magnetic effects is the complex permeability. While at low frequencies in a linear material the magnetic field and the auxiliary magnetic field are simply proportional to each other through some scalar permeability, at high frequencies these quantities will react to each other with some lag time. [36]

  6. Magnetic nanoparticles - Wikipedia

    en.wikipedia.org/wiki/Magnetic_nanoparticles

    Magnetic nanobeads or nanoparticle clusters composed of FDA-approved oxide superparamagnetic nanoparticles (e.g. maghemite, magnetite) hold much potential for waste water treatment since they express excellent biocompatibility which concerning the environmental impacts of the material is an advantage compared to metallic nanoparticles.

  7. Ferrimagnetism - Wikipedia

    en.wikipedia.org/wiki/Ferrimagnetism

    Below the magnetization compensation point, ferrimagnetic material is magnetic. At the compensation point, the magnetic components cancel each other, and the total magnetic moment is zero. Above the Curie temperature, the material loses magnetism. Ferrimagnetism has the same physical origins as ferromagnetism and antiferromagnetism.

  8. Ferrite (magnet) - Wikipedia

    en.wikipedia.org/wiki/Ferrite_(magnet)

    The magnetic material known as "Zn Fe" has the formula Zn Fe 2 O 4, with Fe 3+ occupying the octahedral sites and Zn 2+ occupying the tetrahedral sites, it is an example of normal structure spinel ferrite. [18] [page needed] Some ferrites adopt hexagonal crystal structure, like barium and strontium ferrites BaFe 12 O 19 (BaO : 6 Fe 2 O 3) and ...

  9. Ironsand - Wikipedia

    en.wikipedia.org/wiki/Ironsand

    The magnetite from these areas often contains high amounts of chromium and titanium. [36] In the 19th century ironsand was sometimes used as blotter sand for concrete and masonry work, or more rarely as raw material for steel production; one blacksmith in Connecticut used it for making bar stock. [37]

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