Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...13..779n&link_type=abstract
In: Lunar and Planetary Science Conference, 13th, Houston, TX, March 15-19, 1982, Proceedings. Part 2. (A83-21281 07-91) Washing
Physics
1
Chondrites, Coercivity, Iron Compounds, Magnetic Properties, Meteoritic Composition, Nickel Compounds, Remanence, Chemical Composition, Ferromagnetism, Magnetization, Phase Transformations, Thermomagnetic Effects
Scientific paper
Three chondrites, Yamato-74160 (LL6), ALH-77260 (L3), and St. Severin (LL6), contain a considerable amount of the ordered FeNi, tetrataenite, in their metallic components. Natural remanent magnetization (NRM) of the three chondrites contains a highly stable component which can hardly be demagnetized by alternating magnetic fields up to 1800 Oe peak. The highly stable NRM component is identified to the NRM of the tetrataenite phase which has a large magnetic and optical anisotropy. By heating up to about 800 C, however, the tetrataenite phase is broken down to the ordinary disordered taenite which has a much weaker magnetic coercivity.
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