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 $\mathbf{B}$ is carried out with the aim of achieving a high precision magnetometer. We determine the uncertainty $\Delta B$ 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 $\mathbf{n}$ and the needle orbital angular momentum. The levitation of the magnetic needle in a magnetic trap and its stability are also analyzed.

References in corpus (3)

• Quantum Spin Stabilized Magnetic Levitation
• Magnetomechanical coupling and ferromagnetic resonance in magnetic nanoparticles
• Linear Stability Analysis of a Levitated Nanomagnet in a Static Magnetic Field: Quantum Spin Stabilized Magnetic Levitation

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