Direct observation of ferrimagnetic/ferroelastic domain interactions in magnetite below the Verwey transition
Direct observation of ferrimagnetic/ferroelastic domain interactions in magnetite below the Verwey transition
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DOI：
10.1016/j.epsl.2010.05.004
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发表时间：
2010-08-15
影响因子：
5.3
通讯作者：
Harrison, Richard J.
中科院分区：
文献类型：
--
作者：
Kasama, Takeshi;Church, Nathan S.;Harrison, Richard J.
磁铁矿在低温下的磁性行为主要是由其转变为单斜晶结构，同时具有铁磁性、铁弹性和铁电性，温度低于125 K （Verwey转变）。在这里，我们用电子显微镜揭示了单斜磁铁矿中铁磁性和铁弹性结构之间的关系。我们提出了磁铁矿在加热和冷却过程中的动态观测，揭示了晶体孪晶和磁畴壁之间意想不到的相互作用现象的多样性。这项研究提供了对磁铁矿低温磁性的新认识，将影响广泛的岩石磁性研究，从解释陆地岩石和沉积物中的磁性残余到寻找地外物质中的生物成因磁铁矿。(C) 2010 Elsevier B.V.版权所有
The magnetic behaviour of magnetite at low temperatures is dominated by its transformation to a monoclinic crystal structure that is simultaneously ferrimagnetic, ferroelastic and ferroelectric below similar to 125 K (the Verwey transition). Here we use electron microscopy to reveal the relationship between ferrimagnetic and ferroelastic domain structures in monoclinic magnetite. We present dynamic observations of magnetite during heating and cooling across the Verwey transition, revealing a diversity of unexpected interaction phenomena between crystallographic twins and magnetic domain walls. This study provides a new understanding of the low-temperature magnetic properties of magnetite that will affect a broad range of rock magnetic studies, from the interpretation of magnetic remanence in terrestrial rocks and sediments to the search for biogenic magnetite in extraterrestrial materials. (C) 2010 Elsevier B.V. All rights reserved.