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Title: Ultra-sensitive magnetic microscopy with an optically pumped magnetometer

Abstract

Optically pumped magnetometers (OPMs) based on lasers and alkali-metal vapor cells are currently the most sensitive non-cryogenic magnetic field sensors. Many applications in neuroscience and other fields require high-resolution, high-sensitivity magnetic microscopic measurements. In order to meet this demand we combined a cm-size spin-exchange relaxation-free (SERF) OPM and flux guides (FGs) to realize an ultra-sensitive FG-OPM magnetic microscope. The FGs serve to transmit the target magnetic flux to the OPM thus improving both the resolution and sensitivity to small magnetic objects. We investigated the performance of the FG-OPM device using experimental and numerical methods, and demonstrated that an optimized device can achieve a unique combination of high resolution (80 μm) and high sensitivity (8.1 pT/). Additionally, we also performed numerical calculations of the magnetic field distribution in the FGs to estimate the magnetic noise originating from the domain fluctuations in the material of the FGs. We anticipate many applications of the FG-OPM device such as the detection of micro-biological magnetic fields; the detection of magnetic nano-particles; and non-destructive testing. From our theoretical estimate, an FG-OPM could detect the magnetic field of a single neuron, which would be an important milestone in neuroscience.

Authors:
 [1];  [1]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1291225
Report Number(s):
LA-UR-16-20318
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; atomic and nuclear physics

Citation Formats

Kim, Young Jin, and Savukov, Igor Mykhaylovich. Ultra-sensitive magnetic microscopy with an optically pumped magnetometer. United States: N. p., 2016. Web. doi:10.1038/srep24773.
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Kim, Young Jin, & Savukov, Igor Mykhaylovich. Ultra-sensitive magnetic microscopy with an optically pumped magnetometer. United States. https://doi.org/10.1038/srep24773
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Kim, Young Jin, and Savukov, Igor Mykhaylovich. Fri . "Ultra-sensitive magnetic microscopy with an optically pumped magnetometer". United States. https://doi.org/10.1038/srep24773. https://www.osti.gov/servlets/purl/1291225.
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@article{osti_1291225,
title = {Ultra-sensitive magnetic microscopy with an optically pumped magnetometer},
author = {Kim, Young Jin and Savukov, Igor Mykhaylovich},
abstractNote = {Optically pumped magnetometers (OPMs) based on lasers and alkali-metal vapor cells are currently the most sensitive non-cryogenic magnetic field sensors. Many applications in neuroscience and other fields require high-resolution, high-sensitivity magnetic microscopic measurements. In order to meet this demand we combined a cm-size spin-exchange relaxation-free (SERF) OPM and flux guides (FGs) to realize an ultra-sensitive FG-OPM magnetic microscope. The FGs serve to transmit the target magnetic flux to the OPM thus improving both the resolution and sensitivity to small magnetic objects. We investigated the performance of the FG-OPM device using experimental and numerical methods, and demonstrated that an optimized device can achieve a unique combination of high resolution (80 μm) and high sensitivity (8.1 pT/). Additionally, we also performed numerical calculations of the magnetic field distribution in the FGs to estimate the magnetic noise originating from the domain fluctuations in the material of the FGs. We anticipate many applications of the FG-OPM device such as the detection of micro-biological magnetic fields; the detection of magnetic nano-particles; and non-destructive testing. From our theoretical estimate, an FG-OPM could detect the magnetic field of a single neuron, which would be an important milestone in neuroscience.},
doi = {10.1038/srep24773},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {Fri Apr 22 00:00:00 EDT 2016},
month = {Fri Apr 22 00:00:00 EDT 2016}
}
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https://doi.org/10.1038/srep24773
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    Works referencing / citing this record:

    Measurement of the spatial magnetic field distribution in a single large spin-exchange relaxation-free vapor cell
    journal, January 2019

    • Gusarov, Alexander; Baranga, Andrei Ben-Amar; Levron, David
    • Applied Physics B, Vol. 125, Issue 1
    • DOI: 10.1007/s00340-018-7130-7

    Nondestructive in-line sub-picomolar detection of magnetic nanoparticles in flowing complex fluids
    journal, February 2018

    A magnetic source imaging camera
    journal, July 2016

    • Dolgovskiy, V.; Fescenko, I.; Sekiguchi, N.
    • Applied Physics Letters, Vol. 109, Issue 2
    • DOI: 10.1063/1.4958700

    Hybrid GMR Sensor Detecting 950 pT/sqrt(Hz) at 1 Hz and Room Temperature
    journal, March 2018

    • Guedes, André; Macedo, Rita; Jaramillo, Gerardo
    • Sensors, Vol. 18, Issue 3
    • DOI: 10.3390/s18030790

    Nondestructive in-line sub-picomolar detection of magnetic nanoparticles in flowing complex fluids
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    Nondestructive in-line sub-picomolar detection of magnetic nanoparticles in flowing complex fluids
    journal, February 2018

    A High-Sensitivity Tunable Two-Beam Fiber-Coupled High-Density Magnetometer with Laser Heating
    journal, October 2016

    Hybrid GMR Sensor Detecting 950 pT/sqrt(Hz) at 1 Hz and Room Temperature
    journal, March 2018

    • Guedes, André; Macedo, Rita; Jaramillo, Gerardo
    • Sensors, Vol. 18, Issue 3
    • DOI: 10.3390/s18030790
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