Startlingly strong shape anisotropy of AC magnetic susceptibility due to eddy currents

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10441541" target="_blank" >RIV/00216208:11310/22:10441541 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=CocYPXsVYZ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=CocYPXsVYZ</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/gji/ggab486" target="_blank" >10.1093/gji/ggab486</a>

Result language
angličtina
Original language name
Startlingly strong shape anisotropy of AC magnetic susceptibility due to eddy currents
Original language description
In order to better understand the anisotropy of AC magnetic susceptibility due to eddy currents (EC susceptibility) in rocks and minerals, we investigated the anisotropy of both in-phase (ipAMS) and out-of-phase (opAMS) magnetic susceptibility. Copper cylinders were chosen as experimental material because copper is diamagnetic, internally isotropic magnetically, and its out-of-phase magnetic susceptibility is no doubt due to eddy currents. Results of laboratory measurements were successfully compared to theoretical models. Both the in-phase and out-of-phase EC susceptibility components are strongly frequency dependent. The principal directions of both ipAMS and opAMS are closely related to the shapes of the copper bodies. While the degree of AMS of elongated cylinders asymptotically approaches 2, which is the value for infinite cylinder, it can be two orders higher in strongly flattened cylinders of the same volume. Analysis of directional susceptibilities has shown that EC susceptibility is well described by the tensor of second rank. These results are useful for the structural interpretation of the opAMS of rocks and ores whose opAMS is due to eddy currents (in electrically conductive minerals, such as graphite, and galena).
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10505 - Geology

Project
<a href="/en/project/GA19-17442S" target="_blank" >GA19-17442S: Anisotropy of out-of-phase magnetic susceptibility as a new method for fabric analysis of rocks</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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