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Results tagged with magnetic-fields
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user 35363
For questions that utilize the concept of magnetic fields (commonly denoted by the letter B), or for questions whose answers likely involve magnetic fields. More specific than the [magnetism] tag, as questions about the phenomenon & theory of magnetism do not necessarily involve the discussion of fields.
2
votes
Magnons contribution to spontaneous magnetization
You should not use the free energy
$$
dF= -SdT+\ldots + \mathbf{H}\cdot \frac{d\mathbf{B}}{4\pi}.
$$
Instead, as you said in your post, it is the following thermodynamic potential that matters
$$
d\ …
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