Lodestone: Natures only permanent magnet‐What it is and how it gets charged
Lodestone: Natures only permanent magnet‐What it is and how it gets charged
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磁石：自然界唯一的永磁体——它是什么以及它如何充电
DOI：
10.1029/1999gl900496
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发表时间：
1999
影响因子：
5.2
通讯作者：
G. Kletetschka
中科院分区：
文献类型：
--
作者：
P. Wasilewski;G. Kletetschka
磁铁矿和钛磁铁矿具有磁性，这归因于氧化和出溶过程中形成的微结构：所有属于磁铁矿的磁铁矿都含有磁铁矿。这些磁石的Hc在10到30 Mt之间，SIRM在8到18 am？kg？之间，RI在0.10到0.26之间。磁铁矿、钛磁铁矿和金属的REM值(NRM与SIRM之比)<；0.05。从史密森学会获得的样品(称为闪锌矿)的REM值从0.45到0.92不等。REM值用作与闪电相关的磁场的见证参数。如果一个高的REM值(比如≫0.1)可以被证实不是由于人类的污染，并且不包含MD赤铁矿，那么岩石具有闪电剩余磁化(LRm)。与闪电有关的磁场可以从等温剩磁采集(RA)曲线中揭示出来。
Magnetite and Titanomagnetite exhibit magnetic properties which are attributable to the micro‐structures developed during oxidation and exsolution: All magnetite iron ores which are lodestones contain maghemite. These lodestones have Hc between 10 and 30 mT, SIRM between 8 and 18 Am²kg¹ and RI between 0.10 and 0.26. Magnetite, titanomagnetite and metals have REM values (ratio of NRM to SIRM) < 0.05. Samples (called fulgarites) obtained from the Smithsonian Institution have REM values ranging from 0.45 to 0.92. The REM value serves as a witness parameter to the magnetic fields associated with the lightning bolt. If a high REM value (say ≫ 0.1) can be verified as not to be due to contamination by man and does not contain MD hematite then the rock has LRM (lightning remanent magnetization). The magnetic field associated with lightning can be revealed from an isothermal remanent acquisition (RA) curve.