Hysteresis effects of varying concentrations of magnetite, hematite, pyrrhotite, and greigite grains in a diamagnetic matrix

Kapička, A.; Sjöberg, Bo A.

doi:10.1007/bf01613587

Cited by 1 publication

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“…When a mixture of particles with contrasting grain sizes (SD + SP, SD + MD) or coercivities (i.e. magnetite + hematite or goethite) are present in a sample, constricted hysteresis loops are obtained (Kapicka and Sjoberg, 1993;Roberts et al, 1995). Thus, the commonly used hysteresis parameters alone do not give unambiguous information about the domain state of the ferromagnetic particles.…”

Section: Hysteresis Measurementsmentioning

confidence: 99%

Preliminary Rock Magnetic Study of Archaeomagnetic Samples from Bulgarian Prehistoric Sites.

Jordanova

Petrovský²,

Kovacheva

1997

J. geomagn. geoelec

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Rock magnetic properties of archaeomagnetic samples taken from ovens are studied. Thermal demagnetization of saturation remanences and other studies reveal the presence of: (titano)magnetite, iron oxyhydroxides, and maghemite with Tb -650°C which is stable with respect to inversion. During thermal demagnetization the soft IRM component (0.06 T) is always the strongest one, indicating the importance of the (titano)magnetite contribution. A break-up in the values of coercivity H with respect to initial mass-specific magnetic susceptibility (X) occurs at X -1.5 x 10-6 m3/kg and separates poorer from better quality samples in the palaeointensity experiment. Separation of bad and good Thellier experiments is also observed in the relation between the coercivities and the concentration-independent parameter SIRM/X. Thus, the poor quality of the palaeointensity experiments for some samples can probably be ascribed to the presence of weathering products and MD magnetite grains while the good quality of these experiments is related to "soft" hysteresis properties and a broad unblocking temperature spectrum.

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Section: Hysteresis Measurementsmentioning

confidence: 99%