Other
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...26..125n&link_type=abstract
(International Association of Geomagnetism and Aeronomy, Symposium on Rock Magnetism of Fine Particles, Canberra, Australia, Dec
Other
5
Magnetic Properties, Magnetization, Stony Meteorites, Viscosity, Achondrites, Chondrites, Demagnetization, Lunar Soil, Relaxation Time, Remanence, Af Demagnetization, Meteorites, Stony Meteorites, Magnetization, Isothermal Remanent Magnetization, Chondrites, Yamato Meteorites, Viscous Remanent Magnetization, Yamato-75N, Alha77005, Achondrites, Anhysteric Remanent Magnetization, Yamato-7301, Yamato-6901, Intensity, Yamato-7305, Yamato-74191, Alha7609, Thermal Remanent Magnetization, Chemical Remanent Magneti
Scientific paper
Experimental results suggest that the native iron grains in stony meteorites are of two distinct types: a large grain size group of multidomain structure and a small grain size group of single-domain structure (12-20 nm mean diameter). One L-chondrite (Yamato-75N) is abundant in metallic grains whose relaxation time in nonmagnetic space at atmospheric temperature is about 100,000 s. When it is subjected to a magnetic field for longer than the relaxation time, the apparent coercivity of viscous remanent magnetization (VRM) against AF demagnetization exceeds 100 Oe, much larger than the coercivity of the corresponding isothermal remanent magnetization. Natural remanent magnetization (NRM) of such a stony meteorite can not be attributable to thermal or chemical remanence acquired in extraterrestrial space. A considerable viscous decay of partial anhysteretic remanence (ARM) was evident in an achondrite (Allan Hills-77005). A comparison of NRM lost with ARM lost against AF demagnetization for this achondrite shows that there is a linear relation between NRM and ARM for high alternating magnetic fields not less than 150 Oe, which is distinctly different from a correlation for such fields at not greater than 100 Oe.
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