Larmor precession
= Larmor precession
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<Larmor precession> is the precession of a magnetic moment about an applied magnetic field. For a spin with gyromagnetic ratio $\gamma$ and Hamiltonian $H=-\gamma\mathbf B\cdot\mathbf S$, its expectation obeys $d\langle\mathbf S
angle/dt=\gamma\langle\mathbf S
angle imes\mathbf B$. A spin coherent state retains its coherent form during this rotation.