Abstract
An analysis of a single-domain magnetic needle (MN) in the presence of an external magnetic field is carried out with the aim of achieving a high-precision magnetometer. We determine the uncertainty of such a device due to Gilbert dissipation and the associated internal magnetic field fluctuations that give rise to diffusion of the MN axis direction and the needle orbital angular momentum. The levitation of the MN in a magnetic trap and its stability are also analyzed.
- Received 12 April 2018
- Revised 31 August 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.160801
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