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Thermodynamics - Work done on a paramagnetic material

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Cantique
#1
Apr16-14, 05:33 AM
P: 5
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?
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macdonal
#2
Apr16-14, 04:09 PM
P: 1
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 http://faculty.luther.edu/~macdonal/ .
256bits
#3
Apr17-14, 03:36 AM
P: 1,422
Quote Quote by Cantique View Post
I have seen articles where they use HdM as the work done. Could
Do you know the relationship between B and H?

DrDu
#4
Apr19-14, 06:52 AM
Sci Advisor
P: 3,564
Thermodynamics - Work done on a paramagnetic material

One of the best discussions is given in Landau, Lifshitz, Vol. V, Section 31 and 32.


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