Unshielded SQUID Sensors for Ultra-Low-Field Magnetic Resonance Imaging

Juho Luomahaara, Mikko Kiviranta, Leif Grönberg, Koos Zevenhoven, Petteri Laine

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


We have implemented a new field-tolerant low-critical-temperature superconducting quantum interference device current sensor with submicrometer Josephson junctions. The small junction area enables the fabrication of devices with lower sensor noise and higher tolerance against magnetic fields. An application benefitting from these properties is ultra-low-field magnetic resonance imaging (ULF MRI). In the currently ongoing BREAKBEN project, new technology is being pushed forward by combining ULF MRI with magnetoencephalography in a single instrument. We describe the sensor architecture aimed for this purpose and justify the guidelines behind the design. Experimental characterization reveals that, with the aid of reasonable amount of heating, unshielded sensor operation after high magnetic pulses at least up to 150 mT appears to be possible.
Original languageEnglish
Article number8249832
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - Jun 2018
MoE publication typeA1 Journal article-refereed


This work was supported by the European Union’s Horizon 2020 Research and Innovation Program under Grant 686865.


  • SQUIDs
  • Magnetic sensors
  • Heating systems
  • Junctions
  • Coils
  • OtaNano


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