Thermodynamics - Work done on a paramagnetic material

  1. What is the work done on a paramagnetic? I have seen both of the following:

    [itex]\hat{d}[/itex]w = -MdB
    [itex]\hat{d}[/itex]w = -BdM

    Where B is magnetic field and M is magnetisation

    Am I missing something here or are these two completely opposite? My text book says that -MdB is the work done but I am sure I have seen articles where they use HdM as the work done. Could somebody clear this up for me?
  2. jcsd
  3. See the paper The Form of Magnetic Work in a Fundamental Thermodynamic Equation for a Paramagnet
    Am. J. Phys. 67, 613 (1999).

    A copy can also be obtained at .
  4. Do you know the relationship between B and H?
  5. DrDu

    DrDu 4,639
    Science Advisor

    One of the best discussions is given in Landau, Lifshitz, Vol. V, Section 31 and 32.
Know someone interested in this topic? Share this thead via email, Google+, Twitter, or Facebook

Have something to add?

Draft saved Draft deleted