Nanomagnetic properties of the meteorite cloudy zone

Einsle Joshua F.; Eggeman Alexander S.; Martineau Ben H.Saghi ZinebCollins Sean M.Blukis RobertsBagot Paul A. J.Midgley Paul A.Harrison Richard J.

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Nanomagnetic properties of the meteorite cloudy zone

机译：Nanomagnetic properties of the meteorite cloudy zone

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Meteorites contain a record of their thermal and magnetic history, written in the intergrowths of iron-rich and nickel-rich phases that formed during slow cooling. Of intense interest from a magnetic perspective is the "cloudy zone," a nanoscale intergrowth containing tetrataenite-a naturally occurring hard ferromagnetic mineral that has potential applications as a sustainable alternative to rare-earth permanent magnets. Here we use a combination of high-resolution electron diffraction, electron tomography, atom probe tomography (APT), and micromagnetic simulations to reveal the 3D architecture of the cloudy zone with subnanometer spatial resolution and model the mechanism of remanence acquisition during slow cooling on the meteorite parent body. Isolated islands of tetrataenite are embedded in a matrix of an ordered superstructure. The islands are arranged in clusters of three crystallographic variants, which control how magnetic information is encoded into the nanostructure. The cloudy zone acquires paleomagnetic remanence via a sequence of magnetic domain state transformations (vortex to two domain to single domain), driven by Fe-Ni ordering at 320 degrees C. Rather than remanence being recorded at different times at different positions throughout the cloudy zone, each subregion of the cloudy zone records a coherent snapshot of the magnetic field that was present at 320 degrees C. Only the coarse and intermediate regions of the cloudy zone are found to be suitable for paleomagnetic applications. The fine regions, on the other hand, have properties similar to those of rare-earth permanent magnets, providing potential routes to synthetic tetrataenite-based magnetic materials .

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2018年第49期|E11436-E11445|共10页
作者
Einsle Joshua F.; Eggeman Alexander S.; Martineau Ben H.Saghi ZinebCollins Sean M.Blukis RobertsBagot Paul A. J.Midgley Paul A.Harrison Richard J.;
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作者单位

Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs, England;

Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England;

Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, EnglandCommissariat Energie Atom & Energies Alternat, Lab Elect Technol Informat, MINATEC Campus, F-38054 Grenoble, FranceUniv Oxford, Dept Mat, Oxford OX1 3PH, England;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
meteorite; paleomagnetism; cloudy zone; tomography; rare earth magnets;

Nanomagnetic properties of the meteorite cloudy zone

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