We have a rectangular cubic cavity that is about a few millimeters in size. We put a magnetic system inside this cavity. Then we apply a fixed and static magnetic field to it. We know that this system is full of spins. They will make a Precession motion in the presence of an external magnetic field. Forget them for a moment and assume a semi-classical vector instead. We know that ultimately the total energy of this system consists of the cavity energy and the energy of the magnetic system and the energy of the interaction of the two systems. The question is how to find the energy of the magnetic system.
Dear Parisa Maleki,
The energy of the magnetic system is dependent on the temperature of the cavity and the interaction with the applied field.
The magnetic energy of a single dipole is -μ.Β. So, if there are N total number of dipoles and n number of dipoles are oriented along the field, then the magnetic energy of the system is n( -μΒ) + ( N-n)( μB).
The value of n depends on temperature.
Thanks
N Das
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