Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...26..149w&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 26, Issue 1-2, p. 149-161.
Physics
15
Scientific paper
Magnetic properties of small iron-nickel alloy spheres, having compositions which cover the entire Fe-Ni binary, are presented. The spheres were produced by melting fine wires of appropriate compositions and allowing surface tension forces to form spheres from molten droplets of alloy during initial free fall. Solidification took place before the spheres dropped to the base plate. Continued cooling took place in the geomagnetic field. The spheres with Ni <= 28% acquired a martensitic thermal remanence (MTRM) while those with Ni >= 30% acquired a TRM. Magnetic data obtained from the spheres are used to construct a magnetic remanence (MTRM or TRM and SIRM (saturation remanence)-composition diagram. A coercive force (HC)-composition diagram was also constructed. Magnetic hysteresis loops and derived parameters are utilized to demonstrate the difference between metal-bearing and oxide-bearing natural samples. Many of the magnetic properties of natural metal-bearing samples are directly explicable in terms of the properties of the metal spheres. The magnetic properties of metals and alloys are significantly altered by deviations from spherical shape. The most significant factor dominating magnetic behavior of the spheres is the microstructure.
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