Identification of stable remanence carriers through a magneto-impedance scanning magnetic microscope

M. Uehara, N. Nakamura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


To identify the stable remanence carrier in rock samples, we conducted magnetic microscopic observations combined with conventional stepwise demagnetization experiments. The instrument, which employs an amorphous wire-based magneto-impedance sensor (30 μm diameter, 5 mm length), can document magnetic anomalies (vertical component) of the millimeter to sub-millimeter-thick rock samples with a resolution of 500 μm. Our new technique allows identification of the sources of both stable and unstable remanence components in meteorite and shocked granite samples. However, stray magnetic fields from the sensor magnetize the magnetic minerals in the sample and makes serious artifacts on the magnetic images. Although the artifacts of the induced magnetization should be solved, this new corroborative technique leads to a microscopic discrimination of stable paleomagnetic records from terrestrial and extraterrestrial materials.

Original languageEnglish
Pages (from-to)211-223
Number of pages13
JournalStudia Geophysica et Geodaetica
Issue number2
Publication statusPublished - 2008 Apr


  • Chondrites
  • Demagnetization
  • Extraterrestrial magnetism
  • Magnetic microscope
  • MI sensor
  • Remanent magnetization
  • Vredefort granite


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