Supplementary information for: “Pt and CoB trilayer Josephson π junctions with perpendicular magnetic anisotropy”

The magnetisation data presented in the main text were acquired in a Quantum Design MPMS3 magnetometer. The magnetometer returns measurements of the total magnetic moment of the sample in emu. The total magnetic moment of the sample contains the contributions due to the substrate, thin film, and any spurious signal such as those described by Garcia et al. [1] . Careful sample handing was used to minimise spurious contributions to the total moment. The linear diamagnetic background due to the substrate was subtracted from the total measured moment. We report the data after substrate subtraction as the area normalised magnetic moment (moment/area) in emu/cm by measuring the area of the sample. For a uniform slab of ferromagnetic material, the volume magnetisation (M) can be determined by dividing the saturation moment/area by the thickness of the ferromagnetic layer. M can also be reliably determined by measuring several samples of varying thickness. If one plots moment/area versus thickness (d), as per Figure S1, then the fitted gradient will be M , moment/area = Md. (S1)