Dataset used for the publication "Inhomogeneous nematic-isotropic phase transition of a thermotropic liquid crystal doped with iron oxide nanoparticles" This dataset contains three files. 1. Figure1TEMSource.tif. High resolution cry-TEM image of superparamagnetic particles in a nematic crystal. Images size 669x669 nm, 2048x2048 pixel, 32-bit grey scale. 2. Sung and Abelmann - Supplementary material.ods. Spreadsheet with 2a. Tab 1 linetraces 2b. Measurements of magnetic particle diameter, inter-particle spacing, aggregate size and granule sizes. 3. Figure1TEM.png Easy to display low resolution image. Details on data acquisition and background of research can be found in Sung, B., Yan, H., Kim, C. , & Abelmann, L. (2020). Inhomogeneous nematic-isotropic phase transition of a thermotropic liquid crystal doped with iron oxide nanoparticles. Physics Letters, Section A: General, Atomic and Solid State Physics, 384(36), [126927]. https://doi.org/10.1016/j.physleta.2020.126927