Anhysteretic remanent magnetization (ARM) in magnetite grains

Gillingham D.E.W. and Stacey F.D. (1971) Anhysteretic remanent magnetization (ARM) in magnetite grains. Pure and Applied Geophysics PAGEOPH, 91 1: 160-165. doi:10.1007/BF00879565

Author Gillingham D.E.W.
Stacey F.D.
Title Anhysteretic remanent magnetization (ARM) in magnetite grains
Journal name Pure and Applied Geophysics PAGEOPH   Check publisher's open access policy
ISSN 0033-4553
Publication date 1971
Sub-type Article (original research)
DOI 10.1007/BF00879565
Volume 91
Issue 1
Start page 160
End page 165
Total pages 6
Publisher Birkhäuser-Verlag
Subject 1908 Geophysics
1906 Geochemistry and Petrology
Abstract ARM has been measured in a range of inducing, steady fields up to 50 oersteds and for 6 sizes of magnetite grains with average diameters 5 μm to 174 μm. For all sizes a slight non-linearity of ARM with inducing field was found, apparently comprising a non-linear contribution independent of grain size plus a linear contribution which increased with decreasing grain size. In the largest grains induced ARM agreed well with multidomain grain theory. Relative enhancement of ARM in smaller grains is comparable to the enhancement of thermoremanence and therefore appears to indicate a pseudosingle domain contribution to ARM in small grains. However the observations allow an alternative explanation in terms of more extreme dimension ratios in the smaller grains. Presentation of the equations for multidomain ARM and TRM using observed instead of intrinsic susceptibilities makes it appear that the inadequacy of multidomain theory (and consequent necessity for pseudo-single domain theory) are less serious than has been supposed.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
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