Magnetic hysteresis of magnetite, pyrrhotite and hematite at high temperature
Magnetic hysteresis of magnetite, pyrrhotite and hematite at high temperature
复制标题
磁铁矿、磁黄铁矿、赤铁矿高温磁滞现象
DOI:
10.1093/gji/ggaa569
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发表时间:
2021
影响因子:
2.8
通讯作者:
Dunlop, David J
中科院分区:
文献类型:
--
作者:
Dunlop, David J
The magnetic properties of iron-bearing minerals at above-ambient temperatures control their magnetic expression at depth in the Earth and other planets, as well as the permanent memory they retain as thermoremanence or thermochemical remanence when brought to the surface and cooled. This paper reports magnetic hysteresis parameters measured at temperatures up to the Curie pointTCfor natural pyrrhotite and hematite and for suites of sized magnetites, both natural and synthesized. Domain structure changes can be inferred from the ratio of saturation remanenceMrsto saturation magnetizationMs. In almost all magnetites and pyrrhotites studied,Mrsdecreases more rapidly with increasing measurement temperatureTthanMs, indicating thermal unblocking or vortex development in single-domain grains and addition or remobilization of domain walls at highTin multidomain grains. During cooling of a rock, iron minerals might then denucleate domains or vortices. Coercive forceHc, a measure of stability against changing magnetic fields, also decreases with increasing measurementT, usually at a rate similar to that ofMrs, but often retains a finite value near the Curie point.
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DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
Song Xu;R. Merrill
通讯作者:
R. Merrill
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
N. Sugiura
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DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
D. Dunlop
通讯作者:
D. Dunlop
影响因子:
2.8
作者:
R. Keller;E. Schmidbauer
通讯作者:
R. Keller;E. Schmidbauer
影响因子:
1.6
作者:
F. D. Stacey
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F. D. Stacey