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@ARTICLE{LaTorre:850111,
author = {La Torre, Enrico and Smekhova, Alevtina and
Schmitz-Antoniak, Carolin and Ollefs, Katharina and Eggert,
Benedikt and Cöster, Birte and Walecki, Dirk and Wilhelm,
Fabrice and Rogalev, Andrei and Lindner, Jürgen and Bali,
Rantej and Banerjee, Rudra and Sanyal, Biplab and Wende,
Heiko},
title = {{L}ocal probe of irradiation-induced structural changes and
orbital magnetism in {F}e 60 {A}l 40 thin films via an
order-disorder phase transition},
journal = {Physical review / B},
volume = {98},
number = {2},
issn = {2469-9950},
address = {Woodbury, NY},
publisher = {Inst.},
reportid = {FZJ-2018-04190},
pages = {024101},
year = {2018},
abstract = {Hard x-ray absorption and magnetic circular dichroism
spectroscopy have been applied to study the consequential
changes of the local environment around Fe atoms and their
orbital polarizations in 40 nm thick Fe60Al40 thin films
along the order-disorder (B2 → A2) phase transition
initiated by 20-keV Ne+ ion irradiation with fluences of
(0.75–6) ×1014 ions cm−2. The analysis of the extended
x-ray absorption fine structure spectra measured at the Fe K
edge at room temperature revealed an increased number of
Fe-Fe nearest neighbors from 3.47(7) to 5.0(1) and $∼1\%$
of volume expansion through the transition. The
visualization of the Fe and Al nearest-neighbor
rearrangement in the first coordination shell of Fe
absorbers via the transition was carried out by wavelet
transformations. The obtained changes in Fe coordination are
evidently reflected in the x-ray magnetic circular dichroism
spectra which show an increased orbital magnetic moment of
Fe atoms and a pronounced magnetic multielectronic
excitations peak at ∼60 eV above the edge. The amplitudes
of both peaks demonstrated similar dependencies on the
irradiation fluence. The results of self-consistent density
functional calculations on relaxed Fe60Al40 model structures
for the ordered (B2) and the disordered (A2) phases are
consistent with the experimental findings and point to the
formation of Fe-rich regions in the films studied.},
cin = {PGI-6},
ddc = {530},
cid = {I:(DE-Juel1)PGI-6-20110106},
pnm = {522 - Controlling Spin-Based Phenomena (POF3-522)},
pid = {G:(DE-HGF)POF3-522},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000437735700001},
doi = {10.1103/PhysRevB.98.024101},
url = {https://juser.fz-juelich.de/record/850111},
}