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Magnetic field at a dipole (how many atoms surround the dipole?)

  1. Nov 27, 2011 #1
    1. The problem statement, all variables and given/known data
    Consider a paramagnetic material. The magnetic field generated by each dipole in the material is 1/30 T.

    What is the magnetic field at a given spin, due to the presence of nearby spins?

    2. Relevant equations

    3. The attempt at a solution
    So I need to multiply 1/30 by however many spins are nearby.

    But I'm not sure how many this would be. If the paramagnetic material is in a crystal, then there are 8 dipoles around it, but there are also dipoles below and underneath it. Which ones do I count as 'nearby'? What is the total number of dipoles?

    Also, I'm measuring the magnetic field at one particular dipole. So the magnetic field from that dipole doesn't count, right?
  2. jcsd
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