Neutron depolarization measurements of magnetite in chiton teeth

Neutron depolarization measurements of magnetite in chiton teeth
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石鳖牙齿中磁铁矿的中子去极化测量

DOI:
10.1088/1742-6596/862/1/012024
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发表时间:
2017
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
S. Gilder
S. Gilder
中科院分区:
--
文献类型:
--
作者:
Seifert;M. Schulz;G. Benka;C. Pfleiderer;S. Gilder

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磁铁矿是地壳中最丰富的磁性矿物之一。在单磁区状态下,磁铁矿由于其稳定的、强的剩磁,往往携带着岩石中的剩磁。因此,研究保存在岩石记录中的古代磁场引起了古地磁学家的浓厚兴趣。单区磁铁矿的粒度范围极小,易被氧化,这使得合成和保存几乎是不可能的。因此,关于加压磁铁矿的实验工作大多是在多磁铁矿上进行的。海洋软体动物石胆的齿根是少数几个单域磁铁矿的天然来源之一。我们用振动样品磁强计(VSM)和新近发展起来的中子去极化成像(NDI)技术对壳核样品进行了对比研究。尽管VSM和NDI数据在矫顽力上的偏移量不变,但我们发现这两种技术之间有很好的一致性。
Magnetite constitutes one of the most abundant magnetic minerals in the Earth's crust. In the single domain state, magnetite often carries the magnetic remanence in rocks due to its stable and strong magnetic remanence. Hence it is of keen interest to paleomagnetists who study the ancient magnetic field preserved in the rock record. The extremely small size range and vulnerability to oxidation of single domain magnetite makes synthetization and preservation virtually impossible. Consequently, most experimental work on magnetite under pressure is carried out on multidomain magnetite. The radula of the marine mollusc chiton (Polyplacophora) is one of the few natural sources of single domain magnetite. We have performed a comparative study on samples of chiton radula in a vibrating sample magnetometer (VSM) and with the newly evolving neutron depolarization imaging (NDI) technique. Despite a constant offset between the VSM and NDI data in the coercivity we find a good agreement between the two techniques.
DOI: --
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