Distribution anisotropy: the influence of magnetic interactions on the anisotropy of magnetic remanence
File(s)
Accepted version
Author(s)
Muxworthy, A R
Williams, W
Type
Chapter
Abstract
The anisotropy of magnetic remanence (AMR) is often used as a tool for examining magnetic anisotropy of rocks. However, the influence of magnetostatic interactions on AMR has not been previously rigorously addressed either theoretically or experimentally, though it is widely thought to be highly significant. Using a three-dimensional micromagnetic algorithm, we have conducted a systematic numerical study of the role of magnetostatic interactions on AMR. We have considered both lineation and foliation, by modelling assemblages of ideal single domain grains and magnetically non-uniform magnetite-like cubic grains. We show that magnetostatic interactions strongly affect the measured AMR signal. It is found that depending on the orientation of the single-grain anisotropy and grain spacing it is possible for the AMR signal from a chain or grid of grains to be either oblate or prolate. For non-uniform grains, the degree of anisotropy generally increases with increasing interactions. In the modelling of AMR anisotropy, saturation isothermal remanence was chosen for numerical tractability. The influence of interactions on other types of more commonly measured AMR, are considered in light of the results in this paper. © The Geological Society of London 2004.
Version
Accepted version
Editor(s)
Martín-Hernández
F
Lüneburg
M, C
Aubourg
C
Jackson
M
Date Issued
2004
Citation
Magnetic Fabric: Methods and Applications, 2004, Special Publications, 238, pp.37-47
ISBN
1-86239-170-X
Publisher
Geological Society
Source Title
Magnetic Fabric: Methods and Applications
Start Page
37
End Page
47
Journal / Book Title
Magnetic Fabric: Methods and Applications
Volume
238
Copyright Statement
© The Geological Society of London 2004. Accepted for publication in Magnetic Fabric: Methods and Applications as of 2004.
Publisher Place
London
Source Edition
Special Publications
Edition
Special Publications
Place of Publication
London