Magnetic Flux Fluctuations Due to Eddy Currents and Thermal Noise in Metallic Disks

S. Uzunbajakau; A.P. Rijpma; J. Dolfsma; Hendrikus J.G. Krooshoop; Hermanus J.M. ter Brake; M.J. Peters; Horst Rogalla

doi:10.1109/TMAG.2003.812720

Magnetic Flux Fluctuations Due to Eddy Currents and Thermal Noise in Metallic Disks

S. Uzunbajakau, A.P. Rijpma, J. Dolfsma, Hendrikus J.G. Krooshoop, Hermanus J.M. ter Brake, M.J. Peters, Horst Rogalla

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Abstract

We derive expressions for the magnetic flux in a circular loop due to eddy currents and thermal noise in coaxial metallic disks. The eddy currents are induced by an applied field that changes sinusoidally in time. We give expressions for the eddy current noise when the frequency of the applied field is very low as well as when it is very high. We combine these expressions to obtain one that is valid over the whole frequency range. The theoretical results agree well with experimental ones obtained by means of a superconducting quantum interference device (SQUID) magnetometer system. We also studied the flux due to thermal noise; again, the theoretical results show fair agreement with the experimental ones.

Original language	Undefined
Pages (from-to)	2018-2023
Number of pages	6
Journal	IEEE transactions on magnetics
Volume	39
Issue number	4
DOIs	https://doi.org/10.1109/TMAG.2003.812720
Publication status	Published - 2003

Keywords

IR-40609
METIS-212833

Access to Document

10.1109/TMAG.2003.812720

magnetic-flux-uzunbajakau

Cite this

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title = "Magnetic Flux Fluctuations Due to Eddy Currents and Thermal Noise in Metallic Disks",

abstract = "We derive expressions for the magnetic flux in a circular loop due to eddy currents and thermal noise in coaxial metallic disks. The eddy currents are induced by an applied field that changes sinusoidally in time. We give expressions for the eddy current noise when the frequency of the applied field is very low as well as when it is very high. We combine these expressions to obtain one that is valid over the whole frequency range. The theoretical results agree well with experimental ones obtained by means of a superconducting quantum interference device (SQUID) magnetometer system. We also studied the flux due to thermal noise; again, the theoretical results show fair agreement with the experimental ones.",

keywords = "IR-40609, METIS-212833",

author = "S. Uzunbajakau and A.P. Rijpma and J. Dolfsma and Krooshoop, {Hendrikus J.G.} and {ter Brake}, {Hermanus J.M.} and M.J. Peters and Horst Rogalla",

year = "2003",

doi = "10.1109/TMAG.2003.812720",

language = "Undefined",

volume = "39",

pages = "2018--2023",

journal = "IEEE transactions on magnetics",

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TY - JOUR

T1 - Magnetic Flux Fluctuations Due to Eddy Currents and Thermal Noise in Metallic Disks

AU - Uzunbajakau, S.

AU - Rijpma, A.P.

AU - Dolfsma, J.

AU - Krooshoop, Hendrikus J.G.

AU - ter Brake, Hermanus J.M.

AU - Peters, M.J.

AU - Rogalla, Horst

PY - 2003

Y1 - 2003

N2 - We derive expressions for the magnetic flux in a circular loop due to eddy currents and thermal noise in coaxial metallic disks. The eddy currents are induced by an applied field that changes sinusoidally in time. We give expressions for the eddy current noise when the frequency of the applied field is very low as well as when it is very high. We combine these expressions to obtain one that is valid over the whole frequency range. The theoretical results agree well with experimental ones obtained by means of a superconducting quantum interference device (SQUID) magnetometer system. We also studied the flux due to thermal noise; again, the theoretical results show fair agreement with the experimental ones.

AB - We derive expressions for the magnetic flux in a circular loop due to eddy currents and thermal noise in coaxial metallic disks. The eddy currents are induced by an applied field that changes sinusoidally in time. We give expressions for the eddy current noise when the frequency of the applied field is very low as well as when it is very high. We combine these expressions to obtain one that is valid over the whole frequency range. The theoretical results agree well with experimental ones obtained by means of a superconducting quantum interference device (SQUID) magnetometer system. We also studied the flux due to thermal noise; again, the theoretical results show fair agreement with the experimental ones.

KW - IR-40609

KW - METIS-212833

U2 - 10.1109/TMAG.2003.812720

DO - 10.1109/TMAG.2003.812720

M3 - Article

VL - 39

SP - 2018

EP - 2023

JO - IEEE transactions on magnetics

JF - IEEE transactions on magnetics

SN - 0018-9464

IS - 4

ER -