Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help in superparamagnetism devices

  1. Oct 5, 2005 #1
    does anyone know some useful devices or applications which make use of superparamagnetism phenomena?

    or a website which discuss these devices.

  2. jcsd
  3. Oct 5, 2005 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    As far as devices go, from my half-baked knowledge, superparamagnetism is a bad thing. At some spin density, the exchange interaction has a magnitude that makes the material go paramagnetic (in little portions) at room temperature, due to thermal fluctuations. So, I believe, you have an essentially ferromagnetic material with little paramagnetic domains dispersed in it.

    As for other applications, I've heard of some in the medical imaging industry, but more commonly, dispersions of some transition metal oxides are used in heterogeneous catalysis - for instance in the hydrogenation of vegetable oils. I'm not sure what the role of the magnetic nature of the material is though.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?