Calculation of magnetic field noise from high-permeability magnetic shields and conducting objects with simple geometry
Calculation of magnetic field noise from high-permeability magnetic shields and conducting objects with simple geometry
High-permeability magnetic shields generate magnetic field noise that can limit the sensitivity of modern precision measurements. We show that calculations based on the fluctuation-dissipation theorem allow quantitative evaluation of magnetic field noise, either from current or magnetization fluctuations, inside enclosures made of high-permeability materials. Explicit analytical formulas for the noise …