A new class of natural magnetic materials - The ordering alloys

Details A new class of natural magnetic materials - The ordering alloys A new class of natural magnetic materials - The ordering alloys

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..534w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, May 1988, p. 534-537.

Physics

4

Iron Alloys, Magnetic Materials, Magnetic Properties, Meteoritic Composition, Nickel Alloys, Order-Disorder Transformations, Carbonaceous Chondrites, Cobalt Alloys, Curie Temperature

Scientific paper

It is shown that tetrataenite (approximately FeNi), found in many meteorites, and Josephinite (approximately FeNi3), found in many serpentinized peridotites and possibly in Allende, are atomically ordered alloys. Data are presented, showing magnetic hysteresis loops, coercivity-temperature behavior at cryogenic temperatures, and thermomagnetic curves, that show that these ordered magnetic materials have unique magnetic properties and do not fit the conventional rock magnetism paradigms represented by Fe3O4 serpentinites. The ordered state is characterized by induced magnetic anisotropy, reaching the extreme for the tetragonal truly uniaxial anisotropy in FeNi. It is suggested that these ordered magnetic alloys should be considered a new class of natural magnetic materials.

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