Projects per year
Abstract
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.
| Original language | English |
|---|---|
| Article number | 043901 |
| Number of pages | 10 |
| Journal | Journal of Applied Physics |
| Volume | 130 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 28 Jul 2021 |
| MoE publication type | A1 Journal article-refereed |
Funding
This work has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreements No. 820393 (macQsimal) and No. 852111 (MAX-BAS) as well as from the European Research Council under ERC Grant Agreement No. 678578 (HRMEG). The content is solely the responsibility of the authors and does not necessarily represent the official views of the funding organizations. The authors declare no conflicts of interest.
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- 3 Finished
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MAX-BAS: Magnetic cross-modal brain activity scanner
Ilmoniemi, R. (Principal investigator)
01/08/2019 → 28/02/2021
Project: EU: Framework programmes funding
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MACQSIMAL: Miniature Atomic vapor-Cells Quantum devices for SensIng and Metrology AppLications
Parkkonen, L. (Principal investigator), Roos, S. (Project Member), Lius, E. (Project Member), Iivanainen, J. (Project Member), Henttonen, M. (Project Member), Grön, M. (Project Member), Luostarinen, E. (Project Member), Rintala, E. (Project Member), Zetter, R. (Project Member), Helle, L. (Project Member), Pamilo, S. (Project Member), Avendano, J. (Project Member), Zubarev, I. (Project Member), Pfeiffer, C. (Project Member) & Ahola, O. (Project Member)
01/10/2018 → 30/06/2022
Project: EU: Framework programmes funding
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HRMEG: High-resolution magnetoencephalography: Towards non-invasive corticography
Parkkonen, L. (Principal investigator), Simanainen, S. (Project Member), Vranou, G. (Project Member), Hietala, P. (Project Member), Avendano, J. (Project Member), Itälinna, V. (Project Member), Grön, M. (Project Member), Pfeiffer, C. (Project Member), Luostarinen, E. (Project Member), Yamin, A. (Project Member), Anelli, M. (Project Member), Ahola, O. (Project Member), Roos, S. (Project Member), Henttonen, M. (Project Member), Zubarev, I. (Project Member), Ahtiainen, V. (Project Member), Forsman, A. (Project Member), Iivanainen, J. (Project Member), Sairanen, V. (Project Member), Puthanmadam Subramaniyam, N. (Project Member), Terborg, H. (Project Member), Zetter, R. (Project Member), Rintala, E. (Project Member), Nurminen, M. (Project Member), Helle, L. (Project Member), Zhigalov, A. (Project Member) & Sirkiä, L. (Project Member)
22/08/2016 → 31/08/2022
Project: EU: ERC grants