Example : Magnetic Particles in a Magnetic Field
نویسنده
چکیده
Recall the paramagnetic spin system we discussed in lecture 4. In this system, there are magnets with orientations parallel or antiparallel to a magnetic field. In the parallel orientation, the energy is −mB = −E, where m is the magnetic moment and B is the magnetic field. In the antiparallel orientation the energy is +mB = +E. In lecture 4, we worked out the relative numbers of parallel and antiparallel magnets and found that it depended on the ratio of thermal to magnetic energies.
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