surface diffraction on magnetic nanostructures in thin films using grazing incidence sans. m....
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![Page 1: Surface diffraction on magnetic nanostructures in thin films using grazing incidence SANS. M. Pannetier (a), F. Ott (b), C. Fermon (b), Y. Samson (c) (a)](https://reader035.vdocuments.mx/reader035/viewer/2022062417/5518ca4c550346991f8b59dc/html5/thumbnails/1.jpg)
Surface diffraction on magnetic nanostructures in thin films
using grazing incidence SANS.
M. Pannetier(a), F. Ott(b), C. Fermon(b), Y. Samson(c)
(a) DRECAM/SPEC, CEA Saclay, 91191 Gif sur Yvette FRANCE(b) Lab. Léon Brillouin CEA/CNRS, 91191 Gif sur Yvette FRANCE
(c) CEA Grenoble DRFMC/SP2M, 17 rue des Martyrs 38054 Grenoble France
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Outline
Principle of the experiment
Scattering on a FePd system
Data simulations
Other prospective systems
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Principle of the experiment
Under total reflection angle (c) an evanescent wave is travelling parallel to the surface
penetration depth 10-50 nm
i < c
ki kf
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Scattering geometry
z
x y
neutrons
Incidence plane10-4 < Qy < 10-2 nm-1
600 nm < < 60 µm
incidence plane10-2 < Qy < 3 nm-1
10-1 nm < < 100 nm
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Experimental set-up
Spectrometer PAPOL at the LLB Saclay
sampleslit 1H
Specular reflected beam
Incidence angle on the sample i
slit 2H
diffracted beam
polariser
Detector
Y
X
Z
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FePd layers
Fe0.5Pd0.5 alloy layers “self-organise” in magnetic stripes
Domain sizes : 60 nmWall thickness : 6 nm
Magnetic domains
Field B = Hd + M
Simulation OOMMF
DRFMC CEA Grenoble
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Magnetic sensitivity
Top view
ki
kf
qy
The domains magnetisation contribute to the scatteringNeel caps do not contributeBloch wall do contribute
Néel cap
Mup
Mdo
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M and B components in the layerM B
X
Y
Z
-60
-40
-20
0
20
40
60
0
position
Fie
ld
Field Y
Field Z
-100
-50
0
50
100
0
position
Fie
ld
MagY
Mag Z
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GID scattering on the PSD
c = 0.7°
Beam stop
diffraction
Specular line
Refracted signalQy
Qz
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Calcul plus complet (facteur de forme inclus)
Sin(PhiF) vs Sin(Theta out) ; Theta In = 0.2° (stupide) Gauche ligne sur substrat; droite “vraie situation” (sauf épaisseur) Les échelles de couleurs ne corespondne tpas du tout au meme
intensités!!!
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Problem of the stray fields
The stray fields are not negligible – They create a rather large magnetic potential
outside the layer
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GID
2D grating (top view)
TF
Rods
2/d
d
Ewald sphere
ki
kf
ki
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Other example : Co clusters in Al2O3
Co/Al2O3D.Babonneau et al, APL 76 (2000)
2/ 5.4nmGISANS
Correlationfonction
Formfactor