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Search: WFRF:(Öisjöen Fredrik 1982) > (2012)

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1.
  • Chukharkin Leonidovich, Maxim, 1980, et al. (author)
  • Noise properties of high-T-c superconducting flux transformers fabricated using chemical-mechanical polishing
  • 2012
  • In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 101:4, s. Article Number: 042602 -
  • Journal article (peer-reviewed)abstract
    • Reproducible high-temperature superconducting multilayer flux transformers were fabricated using chemical mechanical polishing. The measured magnetic field noise of the flip-chip magnetometer based on one such flux transformer with a 9 x 9 mm(2) pickup loop coupled to a bicrystal dc SQUID was 15 fT/Hz(1/2) above 2 kHz. We present an investigation of excess 1/f noise observed at low frequencies and its relationship with the microstructure of the interlayer connections within the flux transformer. The developed high-T-c SQUID magnetometers may be advantageous in ultra-low field magnetic resonance imaging and, with improved low frequency noise, magnetoencephalography applications.
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2.
  • Öisjöen, Fredrik, 1982, et al. (author)
  • High-T-c superconducting quantum interference device recordings of spontaneous brain activity: Towards high-T-c magnetoencephalography
  • 2012
  • In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 100:13
  • Journal article (peer-reviewed)abstract
    • We have performed single-and two-channel high transition temperature (high-T-c) superconducting quantum interference device (SQUID) magnetoencephalography (MEG) recordings of spontaneous brain activity in two healthy human subjects. We demonstrate modulation of two well-known brain rhythms: the occipital alpha rhythm and the mu rhythm found in the motor cortex. We further show that despite higher noise-levels compared to their low-T-c counterparts, high-T-c SQUIDs can be used to detect and record physiologically relevant brain rhythms with comparable signal-to-noise ratios. These results indicate the utility of high-T-c technology in MEG recordings of a broader range of brain activity.
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