This archive contains the data associated with “Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition” to meet our obligations under our UKRI grant conditions. This file "readme.txt" contains a brief descrioption of the files. The final plots used to make the figures are in "SAXS_XPCS_Summary_Final.opj" in Origin format. These are provided as a convenience to users who have this software, but they can be reconstructed form the raw data. Much of the data taken during the work this paper reports is from synchrotron beamtimes at Diamond. The spreadsheet "SAXS_XPCS_Measurement_Summary.xlsx" contains a summary fo the conditions of each measurement there. The compressed file "ProcessedData.zip" contains the python code used to analyse the synchrotron data, as well as the processed small angle x-ray scattering (SAXS) and x-ray photon correlation spectroscopy (XPCS) data they produce, as well as the sampel characterisation and magnetometry data that support those measurements.