Dynamics of a Magnetic Needle Magnetometer: Sensitivity to Landau-Lifshitz-Gilbert Damping
Abstract
An analysis of a single-domain magnetic needle in the presence of an external magnetic field B is carried out with the aim of achieving a high precision magnetometer. We determine the uncertainty B of such a device due to Gilbert dissipation and the associated internal magnetic field fluctuations that gives rise to diffusion of the magnetic needle axis direction n and the needle orbital angular momentum. The levitation of the magnetic needle in a magnetic trap and its stability are also analyzed.
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