Projects per year
Thermal motion of charge carriers in a conducting object causes magnetic field noise that may interfere with sensitive measurements near the object. In this paper, we describe a method to compute the spectral properties of the thermal magnetic noise from arbitrarily shaped thin conducting objects. The method is based on modeling divergence-free currents on a conducting surface using a stream function and calculating the magnetically independent noise-current modes. By doing this, we obtain the power spectral density of the thermal magnetic noise as well as its spatial correlations and frequency dependence. We also describe a numerical implementation of the method and verify it against analytic formulas. We provide the implementation as a part of the free and open-source software package bfieldtools.
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Iivanainen, J., Parkkonen, L., Zetter, R., Zubarev, I., Zhigalov, A., Puthanmadam Subramaniyam, N., Pfeiffer, P., Helle, L., Avendano Diaz, J., Yamin, A., Nurminen, M., Grön, M., Ahola, O., Henttonen, M., Lauronen, S., Simanainen, S. & Anelli, M.
22/08/2016 → 31/08/2022
Project: EU: ERC grants
01/08/2019 → 28/02/2021
Project: EU: Framework programmes funding