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@INPROCEEDINGS{SyedMohd:859552,
author = {Syed Mohd, Amir and Pütter, Sabine and Mattauch, Stefan
and Koutsioumpas, Alexandros and Geprägs, Stephan and
Brückel, Thomas},
title = {{M}agnetic structure in epitaxial {F}e/{C}u and
{F}e/{F}e{P}t multilayers {P}robed by {P}olarised {N}eutron
{R}eflectivity},
reportid = {FZJ-2019-00404},
year = {2015},
abstract = {The study of exchange coupling effect between magnetic thin
films is important due to the underlying fundamental Physics
and possibility to develop functional nanostructures for
their potential use in memory devices and sensors. This
effect results in interlayer coupling (e.g.
antiferromagnetic or biquadratic) between ferromagnetic film
separated by a non- magnetic metal or semiconductor film
[1-3]. The exchange coupling also emerges as exchange spring
effect when soft ferromagnetic film (e.g. Fe or Permalloy)
is coupled with hard ferromagnetic film (e.g. L10-FePt) [4].
It has been demonstrated theoretically that in case of
exchange spring effect, magnetization of soft ferromagnet is
pinned at the interface and form a spiral structure under
external magnetic field [5]. It is in fact difficult to
obtain the magnetic profile in exchange coupled multilayers
using conventional magnetometric technique such as SQUID or
MOKE. However, polarised neutron reflectivity (PNR)
technique is unique to obtain depth dependent magnetization
structure in magnetic thin films and multilayers. In this
work we intend to use PNR technique to probe the
magnetization structure in Fe layers in epitaxial Fe/Cu and
Fe/FePt multilayers prepared using molecular beam epitaxy
(MBE).We have deposited [Fe(1.5 nm)/Cu(2.5 nm)]10 multilayer
on Cu (100) buffer layer epitaxially grown on Si (100)
substrate at ~280 K. In-situ reflection high energy electron
diffraction (RHEED) measurements were performed during
deposition to monitor the epitaxial growth. SQUID together
with PNR measurements were done to probe the interlayer
coupling and magnetization structure. The temperature
dependent SQUID measurement rules out the antiferromagnetic
coupling between Fe layers. PNR measurements were performed
at saturation, and after decreasing the field close to
remanence. The spin flip PNR measurement around remnant
reveals that magnetization in Fe layer is non-collinear.In
order to study the exchange spring behaviour in Fe/FePt
multilayers, first we deposited epitaxial FePt thin films on
MgO(100) substrate at ~500 K. Ex-situ x-ray diffraction
measurement confirms the L10 structure of the FePt film
which has hard magnetic behaviour [6]. PNR measurements on
Fe/FePt multilayers are underway, and the results of Fe/Cu
and Fe/FePt multilayers will be discussed in the
presentation.AcknowledgmentsI, SYED MOHD A., acknowledge the
help received from Harald Schneider and Alexandra Steffen.
References1. Grünberg P., Schreiber R., Pang Y., Brodsky M.
B., and Sowers H., Phys. Rev. Lett. 57, 2442, (1986).2. Vaz
C. A. F., Bland J. A. C., Lauhoff G., Rep. Prog. Phys. 71,
056501, (2008).3. Strijkers G. J., Kohlhepp J. T., Swagten
H. J. M., and de Jonge W. J. M., Phys. Rev. Lett. 84,
1812,(2000).4. Fullerton E. E., Jiang J. S., Grimsditch M.,
Sowers C. H., and Bader S. D., Phys. Rev. B 58,
12193,(1998).5. Asti G., Ghidini M., Pellicelli R.,
Pernechele C., Solzi M., Albertini F., Casoli F., Fabbrici
S., ParetiL., Phys. Rev. B 73, 094406, (2008).6. Skomski R.,
Manchanda P., Kumar P., Balamurugan B., Kashyap A., and
Sellmyer D. J., IEEE 49,3215, (2013).},
month = {Jul},
date = {2015-07-12},
organization = {22nd International Colloquium on
magnetic films and surfaces, Krakow
(Poland), 12 Jul 2015 - 17 Jul 2015},
subtyp = {After Call},
cin = {JCNS-FRM-II / PGI-4 / JCNS-2},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106},
pnm = {6212 - Quantum Condensed Matter: Magnetism,
Superconductivity (POF3-621) / 6G15 - FRM II / MLZ
(POF3-6G15) / 6G4 - Jülich Centre for Neutron Research
(JCNS) (POF3-623) / 524 - Controlling Collective States
(POF3-524)},
pid = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6G15 /
G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-524},
experiment = {EXP:(DE-MLZ)MBE-MLZ-20151210 / EXP:(DE-MLZ)MARIA-20140101},
typ = {PUB:(DE-HGF)24},
url = {https://juser.fz-juelich.de/record/859552},
}