BUSCADOR RECOLECTA

Preliminary measurements were performed at HERMES beamline at SOLEIL synchrotron in collaboration with SOLEIL staff, proposal nos. 20200879, 20190565 and 20170904. This work was supported by the EPSRC Cambridge NanoDTC EP/L015978/1,the Winton Program for the Physics of Sustainability, the project CALIPSOplus under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020, and by the European Community under the Horizon 2020 Program, Contract no. 101001290, 3DNANOMAG. L. Skoric acknowledges support from St Johns College of the University of Cambridge. C. Donnelly was supported by the Leverhulme Trust (ECF-2018-016), the Isaac Newton Trust (18-08) and the L'Oréal-UNESCO UK and Ireland Fellowship For Women In Science. A. Hierro-Rodriguez acknowledges support from Spanish AEI under project reference PID2019104604RB/AEI/10.13039/501100011033. The authors acknowledge the University of Vienna research platform MMM Mathematics -Magnetism - Materials, and the FWF project I4917., Peer reviewed

[Description of methods used for collection/generation of data] Experiments obtained using magneto-optical Kerr effect, This work was supported by the European Community under the Horizon 2020 Program, Contract no. 101001290, 3DNANOMAG., Peer reviewed

[Description of methods used for collection/generation of data] Data was generated utilizing the code and model described in the main text of the publication. [Methods for processing the data] Self-developed python code provided with data., Raw data for this publication, including Fourier-resolved magneto-optical Kerr effect maps and selected analysis of them, as shown in the paper., This work was supported by UKRI through an EPSRC studentship, EP/N509668/1 and EP/R513222/1, the European Community under the Horizon 2020 Program, Contract No. 101001290 (3DNANOMAG), the MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1), and the Aragon Government through the Project Q-MAD., The data is structured in different folders for each of the figures: - Figure4: contains HDF5 file "ParticularCases.h5", with the necessary data to generate the maps shown in figure 4. - Figure5: contains as ".npy" files the values for the optical and magneto-optical parameters for figure (a), as well as the error as a function of the number of averages for figure (c). - ResultsTable: contains the files necessary to generate the results shown in table II. The files "sstate" correspond to the "S" error results, whereas the "shared" correspond to the "SC" error results of the table. - SM1: contains the HDF5 files to generate the maps shown in figure 1 of the supplementary material for the different materials specified in the text. - SM2: contains the HDF5 files to generate the maps shown in figure 2 of the supplementary material for linear polarization and the magnetic configurations specified in the text. - SM4: contains the data needed to generate the uniqueness plot. "One theta" and "Two theta" are the data-sets when using respectively one or two different incidence angles for different optical plane values. The numpy arrays inside contain the fit values for each of the variables as a function of the number of fits as described in the supplementary text. These should be compared with the Permalloy values written in the main text, an incidence angle of 60 degrees and an optical plane angle of 13 degrees., Peer reviewed