Journal Article

FZJ-2020-02975

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nanoscale measurement of giant saturation magnetization in α″-Fe16N2 by electron energy-loss magnetic chiral dichroism

Chen, X. ; Higashikozono, S. ; Ito, K. ; Jin, L.FZJ* ; Ho, P.-L. ; Yu, C.-P. ; Tai, N.-H. ; Mayer, J.FZJ* ; Dunin-Borkowski, R. E.FZJ* ; Suemasu, T. ; Zhong, X. (Corresponding author)

2019
Elsevier Science Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.ultramic.2019.02.016

Abstract: 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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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)
2. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. IMAGINE - Imaging Magnetism in Nanostructures using Electron Holography (320832) (320832)

Appears in the scientific report 2020

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