Observation of Nanoscale Skyrmions in SrIrO3/SrRuO3 Bilayers - Meng,K-Y; Ahmed,AS; Bacani,M; Mandru,A-O; Zhao,X; Bagues,N; Esser,BD; Flores,J; McComb,DW; Hug,HJ; Yang,F (NANO LETTERS, 2019)