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@ARTICLE{Chen:878654,
author = {Chen, Xinfeng and Higashikozono, Soma and Ito, Keita and
Jin, Lei and Ho, Ping-Luen and Yu, Chu-Ping and Tai,
Nyan-Hwa and Mayer, Joachim and Dunin-Borkowski, Rafal E.
and Suemasu, Takashi and Zhong, Xiaoyan},
title = {{N}anoscale measurement of giant saturation magnetization
in α″-{F}e16{N}2 by electron energy-loss magnetic chiral
dichroism},
journal = {Ultramicroscopy},
volume = {203},
issn = {0304-3991},
address = {Amsterdam},
publisher = {Elsevier Science},
reportid = {FZJ-2020-02975},
pages = {37 - 43},
year = {2019},
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.},
cin = {ER-C-1 / ER-C-2},
ddc = {570},
cid = {I:(DE-Juel1)ER-C-1-20170209 / I:(DE-Juel1)ER-C-2-20170209},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)
/ IMAGINE - Imaging Magnetism in Nanostructures using
Electron Holography (320832)},
pid = {G:(DE-HGF)POF3-143 / G:(EU-Grant)320832},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:30862364},
UT = {WOS:000465021000005},
doi = {10.1016/j.ultramic.2019.02.016},
url = {https://juser.fz-juelich.de/record/878654},
}