Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...76..123p&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 76, Issue 1-2, p. 123-130.
Physics
2
Scientific paper
A remanence-based technique, developed recently in magnetic recording media research with the aim of identifying the nature and intensity of interparticle magnetic-interaction fields, is reported. The technique is based on Wohlfarth's linear relation linking isothermal remanent magnetization (IRM) acquisition and saturation IRM (SIRM) d.c. demagnetization with the field as a parameter, deviation from the linearity being attributed to many-body effects. Physical interpretation of an interaction-dependent parameter is discussed. The method is demonstrated on artificial samples of synthetic fine-grained haematite with various grain sizes and shapes and different initial magnetic configurations (i.e. the degree of spin-spin ordering). The observed negative character of interactions, yielding a net demagnetizing effect, is attributed to the specific arrangement of magnetic particles in the specimens and/or to a significant portion of superparamagnetic particles in some specimens.
Hejda Pavel
Kropacek Vladimir
Petrovský Eduard
Subrt J.
Zelinka T.
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