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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2007.08963 |
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| _version_ | 1866914838097166336 |
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| author | Iivanainen, Joonas Mäkinen, Antti J. Zetter, Rasmus Zevenhoven, Koos C. J. Ilmoniemi, Risto J. Parkkonen, Lauri |
| author_facet | Iivanainen, Joonas Mäkinen, Antti J. Zetter, Rasmus Zevenhoven, Koos C. J. Ilmoniemi, Risto J. Parkkonen, Lauri |
| contents | Thermal motion of charge carriers in a conducting object causes magnetic field noise that interferes with sensitive measurements nearby the conductor. In this paper, we describe a method to compute the spectral properties of the thermal magnetic noise from arbitrarily-shaped thin conducting objects. We model divergence-free currents on a conducting surface using a stream function and calculate the magnetically independent noise-current modes in the quasi-static regime. We obtain the power spectral density of the thermal magnetic noise as well as its spatial correlations and frequency dependence. We describe a numerical implementation of the method; we model the conducting surface using a triangle mesh and discretize the stream function. The numerical magnetic noise computation agrees with analytical formulas. We provide the implementation as a part of the free and open-source software package bfieldtools. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2007_08963 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | A general method for computing thermal magnetic noise arising from thin conducting objects Iivanainen, Joonas Mäkinen, Antti J. Zetter, Rasmus Zevenhoven, Koos C. J. Ilmoniemi, Risto J. Parkkonen, Lauri Computational Physics Thermal motion of charge carriers in a conducting object causes magnetic field noise that interferes with sensitive measurements nearby the conductor. In this paper, we describe a method to compute the spectral properties of the thermal magnetic noise from arbitrarily-shaped thin conducting objects. We model divergence-free currents on a conducting surface using a stream function and calculate the magnetically independent noise-current modes in the quasi-static regime. We obtain the power spectral density of the thermal magnetic noise as well as its spatial correlations and frequency dependence. We describe a numerical implementation of the method; we model the conducting surface using a triangle mesh and discretize the stream function. The numerical magnetic noise computation agrees with analytical formulas. We provide the implementation as a part of the free and open-source software package bfieldtools. |
| title | A general method for computing thermal magnetic noise arising from thin conducting objects |
| topic | Computational Physics |
| url | https://arxiv.org/abs/2007.08963 |