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@INPROCEEDINGS{Ptter:902529,
author = {Pütter, Sabine and Mattauch, Stefan and Koutsioumpas,
Alexandros and Schöffmann, Patrick and Syed Mohd, Amir and
Zhernenkov, Kirill and Babcock, Earl and Salhi, Zahir and
Ioffe, Alexander and Brückel, Thomas},
title = {{R}evealing magnetic properties of thin films utilizing
polarized neutrons},
reportid = {FZJ-2021-04337},
year = {2021},
abstract = {Polarized neutron reflectometry (PNR) is a versatile probe
for the study of the magnetic moment with depth resolution.
As self-calibrating technique, it provides independently
values of the magnetic moment, its direction in the film
plane, and film thickness together with its scattering
length density values. It is layer selective and buried
layers in multilayer systems can be analyzed [1].In this
contribution we will provide an overview of the
possibilities of PNR as well as present the reflectometer
MARIA [2]. It is a state of the art reflectometer at the
constant neutron flux reactor in Garching, Germany. MARIA
exhibits a high dynamic range of up to 7-8 orders of
magnitude and a maximum Q (momentum transfer vector) higher
than 0.25 Å$^{-1}$. With the combination of a 400 x 400
mm$^2$ position sensitive detector and a time-stable 3He
polarization spin filter based on Spin-Exchange Optical
Pumping (SEOP), the instrument is well equipped for
investigating specular reflectivity and off-specular
scattering from magnetic thin films and artificially
fabricated structures like nano-dots, gratings, etc. down to
the monolayer regime in full spin polarization. Furthermore,
the GISANS option can be used to investigate lateral
correlations in the nm range. Due to the large detector and
pinhole collimation of the incident neutron beam even
grazing incidence diffraction measurements are possible. All
the options, like GISANS, neutron polarization and 3He
polarization spin filter can be moved in and out of the
neutron beam within seconds by remote controlled push button
operation and do not require any realignment.Magnetic fields
can be applied up to 5 T and a low temperature sample
environment (down to 3 K) is offered. Thin film samples may
be fabricated in a MBE system nearby (deposition materials
according to the requirements of the user). For
investigation of samples which are sensitive to ambient
conditions a UHV transport and measurement chamber with base
pressure in 10−10 mbar range is provided (transfer forth
and back) [3]. Typical substrate size for investigation is
10x10 mm$^2$.Examples for PNR investigation of thin films
like e.g. NiO/Fe/L10-FePt, SrCoO$_x$, Co/W(110),
Fe$_4$N/LaAlO$_3$(001) are discussed. However, the MARIA
reflectometer and the MBE system are user instruments. Hence
we offer measurement and sample preparation time to
interested users [4]. Let’s discuss your ideas![1] J. A.
C. Bland and C. A. F. Vaz, Chapter 7 in J. A. C. Bland and
B. Heinrich, Eds., Ultrathin Magnetic Structures III,
Springer-Verlag Berlin (2005)[2] Heinz Maier-Leibnitz
Zentrum. (2015). J. large-scale research facilities, 1, A8.
http://dx.doi.org/10.17815/jlsrf-1-29; S. Mattauch, A.
Koutsioumpas, et al., J. appl. Crystallography, 51, 646
(2018)[3] A.Syed Mohd, S.Pütter, et al., Rev. Sci. Instrum.
87, 123909(2016)[4]
www.mlz-garching.de/maria;www.mlz-garching.de/mbe},
month = {Jun},
date = {2021-06-13},
organization = {Advances in Magnetics 2020-21, Moena
(Italy), 13 Jun 2021 - 16 Jun 2021},
subtyp = {After Call},
cin = {JCNS-4 / JCNS-1 / JCNS-FRM-II / JCNS-2},
cid = {I:(DE-Juel1)JCNS-4-20201012 / I:(DE-Juel1)JCNS-1-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-2-20110106},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
(POF4-6G4) / 632 - Materials – Quantum, Complex and
Functional Materials (POF4-632) / $NFFA-Europe_supported$ -
Technically supported by Nanoscience Foundries and Fine
Analysis Europe $(2020_Join2-NFFA-Europe_funded)$},
pid = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632 /
$G:(DE-HGF)2020_Join2-NFFA-Europe_funded$},
experiment = {EXP:(DE-MLZ)MARIA-20140101 / EXP:(DE-MLZ)MBE-MLZ-20151210},
typ = {PUB:(DE-HGF)24},
url = {https://juser.fz-juelich.de/record/902529},
}