About the dataset

This dataset supports a study where fractional skyrmion tubes were observed in double-helical nanowires fabricated by 3D nano-printing using focused electron beam-induced deposition. 

The dataset includes code, images and processed data for reproducing the figures from the associated paper, and is intended to support researchers interested in reproducing the data of the scientific article, including simulations and experiments. For more information about the code and data, please refer to the readme.txt file.

The published preprint can be found here: https://arxiv.org/abs/2412.14069

Data & File Overview

1) Micromagnetic SimulationsContains Mumax3 files and scripts used to generate simulated data for the publication:

shape.go: Modified Mumax3 source file enabling double-helix geometry.

Double_Helix_Phase_Diagram.mx3: Script for calculating the energetic phase diagram (Fig. 1d), run with varying Msat, arm_Separation, and nm_per_turn_d.

Double_Helix_Two_Vortex_State_Hysteresis_Loop.mx3 + .ovf: Script and initial state for hysteresis loop simulations (Figs. 2e/f/k).

Double_Helix_Two_Vortex_State_Minor_Hysteresis_Loop.mx3 + Hybrid_Vortex-AP_State_MinorLoop.ovf: For minor loop simulations starting from hybrid vortex–AP states (Fig. 3c + Supplementary).

Double_Helix_Two_Vortex_State_Topological_Charge_Variation.mx3 + .ovf: For topological charge variation in two-vortex state (Figs. 4c/d).

Double_Helix_Fractional_Skyrmion_State_Topological_Charge_Variation.mx3 + .ovf: For topological charge variation in fractional Skyrmion state (Figs. 4e/f/g/h).

2) XMCDContains original ptychographic XMCD data from SOLEIL (beamtime 20210958, June 2022), processed from CL and CR reconstructions, aligned and normalized. Data saved as .dat arrays and .png images with field values in filenames. Includes metadata in [figure_name]_data_list.csv.

Fig2: Data for Fig. 2; includes Fig2_fitparameters.dat (linecut fit results for experimental loops in Fig. 2j).

SFig4: Data for Fig. 2 and Supplementary Fig. 4.

SFig5-major: Data for Fig. 3 and Supplementary Fig. 5.

SFig5-minor: Data for Fig. 3 and Supplementary Figs. 5 & 6.

SFig9: Data for Supplementary Fig. 9.

3) SEMContains an original SEM image of the fabricated double-helix structures used in Fig. 1.

4) TEMContains original TEM images of the FEBID Co nanostructure, used in Supplementary Fig. 7.

Requirements

The code can be executed using Python, MATLAB, Paraview and Mumax3, depending on the file.

The images can be opened with any standard image software.

Licenses

The data is licensed under CC-BY, the code is licensed under MIT.