Hauptseite > Publikationsdatenbank > Nanoscale measurement of giant saturation magnetization in α″-Fe16N2 by electron energy-loss magnetic chiral dichroism > print

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024 7 _ |a 10.1016/j.ultramic.2019.02.016
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100 1 _ |a Chen, Xinfeng
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245 _ _ |a Nanoscale measurement of giant saturation magnetization in α″-Fe16N2 by electron energy-loss magnetic chiral dichroism
260 _ _ |a Amsterdam
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|b Elsevier Science
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520 _ _ |a Metastable α″-Fe16N2 thin films were reported to have a giant saturation magnetization of above 2200 emu/cm3 in 1972 and have been considered as candidates for next-generation rare-earth-free permanent magnetic materials. However, their magnetic properties have not been confirmed unequivocally. As a result of the limited spatial resolution of most magnetic characterization techniques, it is challenging to measure the saturation magnetization of the α″-Fe16N2 phase, as it is often mixed with the parent α′-Fe8N phase in thin films. Here, we use electron energy-loss magnetic chiral dichroism (EMCD), aberration-corrected transmission electron microscopy, X-ray diffraction and macroscopic magnetic measurements to study α″-Fe16N2 (containing ordered N atoms) and α′-Fe8N (containing disordered N atoms). The ratio of saturation magnetization in α″-Fe16N2 to that in α′-Fe8N is determined to be 1.31 ± 0.10 from quantitative EMCD measurements and dynamical diffraction calculations, confirming the giant saturation magnetization of α″-Fe16N2. Crystallographic information is also obtained about the two phases, which are mixed on the nanoscale.
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536 _ _ |a IMAGINE - Imaging Magnetism in Nanostructures using Electron Holography (320832)
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700 1 _ |a Higashikozono, Soma
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700 1 _ |a Ito, Keita
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700 1 _ |a Jin, Lei
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700 1 _ |a Ho, Ping-Luen
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700 1 _ |a Yu, Chu-Ping
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700 1 _ |a Tai, Nyan-Hwa
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700 1 _ |a Mayer, Joachim
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700 1 _ |a Dunin-Borkowski, Rafal E.
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700 1 _ |a Suemasu, Takashi
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700 1 _ |a Zhong, Xiaoyan
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773 _ _ |a 10.1016/j.ultramic.2019.02.016
|g Vol. 203, p. 37 - 43
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