The data that support the findings of this study are openly available at the following URL/DOI: https://doi.org/10.15125/BATH-01597 [49].

49. Fern W R, Wilcox J A and Bending S J 2025 Dataset for Breakdown of the critical state in ferromagnetic superconductor EuFe2(As$ _{1-x}$Px)2 (University of Bath Research Data Archive)