1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Magnetism of Solids

  1. Apr 11, 2015 #1
    1. The problem statement, all variables and given/known data
    N0Mdlnt.png

    2. Relevant equations


    ##\mathcal{X}=\frac{\mu^2_BNg^2_j}{3k_BT}J(J+1)=\frac{C}{T}##

    ##M=\mathcal{X}H##

    3. The attempt at a solution

    ##Fe^{2+}## has a value 4 of J from hunds rules.

    So I know what the curie factor for iron is

    ##M=\frac{m}{V}=\frac{HC}{T}##

    ##m=\frac{HVC}{T}##

    I don't know how I am supposed to treat the sample, assuming that MgO has a temp independent, diamagnetic susceptibility means that the changing magnetic moment is just from the iron but I am not sure how to use this?
     
  2. jcsd
  3. Apr 11, 2015 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    You will need to think around the subject for a bit to seek inspiration.
    i.e. if you were to plot a graph of magnetic moment vs temp - what sort of curve would the MgO alone get you? What sort of curve for Fe aone? What sort of shape is the combined curve likely to be?
    What happens to the magnetic moment of the sample as the temperature increases? Describe in terms of the relative moments of the MgO and the Fe.
     
  4. Apr 11, 2015 #3
    Drawing the graph helped, thanks, the combined graph goes as 1/T and tends towards the magnetic moment of MgO as T increases.

    What do you mean by "Describe in terms of the relative moments of the MgO and the Fe."?

    Also what should I try to be working out, the susceptibility of Mg0, the volumes?

    The equation for the curve I have is

    ##m_{total}=HV_{FE}\frac{C}{T}+HV_{MgO}\mathcal{X}_{MgO}##

    ##m_{total}=H(V_{FE}\frac{C}{T}+V_{MgO}\mathcal{X}_{MgO})##
     
  5. Apr 11, 2015 #4

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    You are supposed to be working out the mass ratio...
     
  6. Apr 12, 2015 #5
    I'm aware of that but I can't see how to get to it, I have a formula with volume in it due to the magnetization/magnetic moment relation which I don't know how to deal with.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Magnetism of Solids
  1. Solid state (Replies: 1)

  2. Solid state magnetism (Replies: 4)

  3. Mechanics of Solids (Replies: 0)

  4. Solid Compressability (Replies: 1)

  5. Pressure of a Solid (Replies: 0)

Loading...