Ferromagnetic Co₃Sn₂S₂ thin films fabricated by co-sputtering

We synthesized the magnetic Weyl semimetal candidate Co₃Sn₂S₂ as a thin film using the co-sputtering technique. By adjusting the film composition using a sulfur-rich SnS_1.5 target with Co metal chips attached, we obtained highly crystallized, single-phase Co₃Sn₂S₂ films. The films showed a ferromagnetic transition around 180 K with perpendicular remanent magnetization. We observed the anomalous Hall effect with a tangent of Hall angle of 0.20 at 130 K, as previously reported for the bulk single crystals. Angular dependence measurements suggested that the magnetization reversal process governed by the domain wall motion leads to a large coercive field in the films.