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Ferrimagnetism vs ferromagnetism

  1. Sep 17, 2010 #1
    Hello All,

    I am trying to learn about the diffrerent types of magnetism and would like to know how we can tell the difference between ferri- and ferromagnetism? Are their any measurements which can distinguish unequivocally between the two types?

    Thank you for any help
     
  2. jcsd
  3. Sep 17, 2010 #2
    From: http://en.wikipedia.org/wiki/Ferrimagnetism

    In physics, a ferrimagnetic material is one in which the magnetic moments of the atoms on different sublattices are opposed, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous magnetization remains. This happens when the sublattices consist of different materials or ions (such as Fe2+ and Fe3+).

    Ferrimagnetism is exhibited by ferrites and magnetic garnets. The oldest-known magnetic substance, magnetite (iron(II,III) oxide; Fe3O4), is a ferrimagnet; it was originally classified as a ferromagnet before Néel's discovery of ferrimagnetism and antiferromagnetism in 1948 [1].

    Some ferrimagnetic materials are YIG (yttrium iron garnet) and ferrites composed of iron oxides and other elements such as aluminum, cobalt, nickel, manganese and zinc.
     
  4. Sep 17, 2010 #3
    Hello pallidin,

    Thanks for the quick reply.

    Ok so let's assume we are talking about an Fe-oxide for which we don't have any knowledge of the proportions of Fe3+ and Fe2+ but we want to know which type of magnetism it exhibits. Is there a measurement of its magnetic properties we can make which will differentiate between ferri- and ferro? (I know that by implication ferri => some Fe2+)

    Thanks
     
    Last edited: Sep 17, 2010
  5. Sep 17, 2010 #4
    Thanks. Wish I had more knowledge on this subject.
    Perhaps an expert can jump-in and elucidate.
     
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