A general method for computing thermal magnetic noise arising from thin conducting objects

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.

Description

| openaire: EC/H2020/820393/EU//MACQSIMAL | openaire: EC/H2020/852111/EU//MAX-BAS | openaire: EC/H2020/678578/EU//HRMEG

DOI

10.1063/5.0050371

Citation

Iivanainen, J, Mäkinen, A J, Zetter, R, Zevenhoven, K C J, Ilmoniemi, R J & Parkkonen, L 2021, ' A general method for computing thermal magnetic noise arising from thin conducting objects ', Journal of Applied Physics, vol. 130, no. 4, 043901 . https://doi.org/10.1063/5.0050371

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202108098272

Collections

[article-cris] Perustieteiden korkeakoulu / SCI

Show all metadata

A general method for computing thermal magnetic noise arising from thin conducting objects

Access rights

URL

Journal Title

Journal ISSN

Volume Title

Authors

Date

Department

Major/Subject

Mcode

Degree programme

Language

Pages

Series

Abstract

Description

Keywords

Other note

DOI

Citation

Permanent link to this item

Collections