Magnetic domains and magnetic stability of cohenite from the Morasko iron meteorite

Magnetic domains and magnetic stability of cohenite from the Morasko iron meteorite
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莫拉斯科铁陨石中的钴辉石的磁畴和磁稳定性

DOI:
10.1016/j.jmmm.2016.10.161
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发表时间:
--
影响因子:
2.7
通讯作者:
Jackson
Jackson
中科院分区:
材料科学3区
文献类型:
--
作者:
Reznik;Kontny;Uehara;Gattacceca;Solheid;Jackson

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利用电子背散射衍射、Bitter花样技术、磁光成像技术和磁力显微镜研究了Morasko铁陨石中硬硅钙石颗粒的磁性、织构和显微结构。与kamacite相比,Cohenite显示出更强的磁对比度,因为它比Fe-Ni合金更硬,因此会导致更高的杂散场。令人惊讶的结果是当施加高达1.5T的高磁场并将其暴露于高于约220 °C的居里温度的高温时,在柯黑云母中的全局条纹状磁畴结构的高稳定性和可逆性。在大气条件下加热至700 °C表明,硬硅钙石保持稳定,并且全球磁畴结构主要恢复到其预热状态。这一观察结果表明,磁畴强烈控制的晶体各向异性的铁橄榄石。在晶界处的分支磁畴结构可以退火到kamacite,这表明它们是非常敏感的记录变形。EBSD观察清楚地表明,从易[010]晶轴和应力局部化的增加的偏差是控制Bitter图案的失真的主要因素,并建议的高灵敏度的Cohenite磁畴结构的局部微观结构的不均匀性。这项研究的结果证实了硬硅钙石可以很好地记录行星核心材料中的磁场的理论。
Magnetic properties, texture and microstructure of cohenite grains from Morasko iron meteorite have been investigated using electron backscattered diffraction, Bitter pattern technique, magneto-optical imaging method and magnetic force microscopy. Cohenite shows much stronger magnetic contrast compared to kamacite because it is magnetically harder than the Fe-Ni alloy, and thus causes higher stray fields. A surprising result is the high stability and reversibility of the global stripe-like magnetic domain structure in cohenite when applying high magnetic fields up to 1.5 T, and exposing it to high temperatures above the Curie temperature of about 220 °C. Heating up to 700 °C under atmosphere conditions has shown that cohenite remains stable and that the global magnetic domain structures mainly recover to its preheating state. This observation suggests that magnetic domains are strongly controlled by the crystal anisotropy of cohenite. Branching magnetic domain structures at the grain boundary to kamacite can be annealed, which indicates that they are very sensitive to record deformation. EBSD observations clearly demonstrate that increasing deviation from the easy [010] crystallographic axis and stress localization are the main factors controlling the distortion of Bitter patterns, and suggest a high sensitivity of the cohenite magnetic domain structure to local microstructural heterogeneities. The results of this study substantiate the theory that cohenite can be a good recorder of magnetic fields in planetary core material.
DOI: 10.1002/crat.200410307
发表时间: 2005
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