A transmission electron microscope study of Neel skyrmion magnetic textures
in multilayer thin film systems with large interfacial chiral interaction
S. McVitie1#, S. Hughes1, K. Fallon1, S. McFadzean1, D. McGrouther1, M. Krajnak1*, W. Legrand2, D. Maccariello2, S. Collin2, K. Garcia2, N. Reyren2, V. Cros2, A. Fert2, K. Zeissler3, C. H. Marrows 3
1Scottish Universities Physics Alliance, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ United Kingdom
2Unit‚ Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Universit‚ Paris-Saclay, 91767 Palaiseau, France
3School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom 
*Current address: Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.
# Email: stephen.mcvitie@glasgow.ac.uk

Transmission Electron Microscopy data 
Raw data was acquired using Gatan's Digital Micrograph file format ( http://www.gatan.com/products/tem-analysis/gatan-microscopy-suite-software. Files may be opened using the Gatan software, however the files are readable by open source software package HyperSpy (http://hyperspy.org/). All data was acquired using a JEOL ARMcFEG instrument at 200kV, equipped with a Gatan Quantum electron spectrometer for EELS measurements and a Medipix3 detector for differential phase contrast. 
Micromagnetic simulation software
The simulation package was run using the MuMax code as detailed in the paper. The files provided here are in Digital Micrograph format as *.dm3.
TEM images calculation
Fresnel images were calculted using the Digital Micrograph program wriiten at thr University of Glasgow which implemented the Mansuripur code to calculate the magnetic phase effect and standard wave optical calculations to then calculate the magnetic images. 
All images are provided as *.dm3 or *.tiff file format.

Figure 1 
All EELS datasets were collected using a 200kV accelerating voltage with a STEM probe current of approx. 180pA at a 2cm camera length, probe convergence half angle 29mrad and a collection half angle of 36mrad.
(a) SI 3_SI Survey Image.dm3 shows the region of Interest (ROI) with the image captured at 1.5Mx magnification using Gatan ADF STEM detector.

The  pair of files PCA Reconstruction [0-8] of SI3_EELS Spectrum Image . show the outputs from the Multivariate Statistical Analysis  routine Ver 4.2 ( G. Lucas et al., Micron 52-53 (2013) p.49-56) on the original Spectrum images (SI 3_EELS Spectrum Image (low-loss) & (high-loss).

(b) The resultant extracted compositional maps are shown in the three images (Pt M / Ir M / Co L Percent Composition

Figure 2 
Dark field STEM image28_DF.dm3 

Figure 4
Simulation magnetisation files are skX Mx/My/Mz and Fresnel image
(a) is skX Mx, (b) is skX Mz (c) skX Fresnel
(d) fresnel30_calib.dm3, (e) fresnel33_calib.dm3, (f) fresnel35_calib.dm3

Figure 5
(a) low mag focus.dm3, (b) ML 20x_2.tiff, inset FFT ML 20x_2.tiff
(c) ML 20x_Fresnel28.tiff, (d) ML 20x_Fresnel34.tiff

Figure 6
(a) x_descanremoved_balanced_rot44_calibrated
(b) x_descanremoved_balanced_calibrated_rot46

Supplementary figures

Figure S1

Figure S2

Figure S3

Figure S4