A Can Fluctuation-Dissipation Theorem Apply to Magnetic Forces

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1. Jul 21, 2016

Spin Operator

Let's say I have multiple spin systems (atoms in a protein) in a solution of water and the spin systems are all producing a magnetic field $$\mathrm{B_{loc}}$$ that affects nearby spin systems.
Will the fluctuation-dispersion theorem apply to the force generated by a spin's magnetic field $$Force_{B_{local}}$$? I know it applies to the force R generated by collisions between the spins and water using the Langeval equation but what about the force between spins?

2. Jul 26, 2016