Role of polar compensation in interfacial ferromagnetism of LaNiO3/CaMnO3 superlattices

C. L. Flint,1,2 H. Jang,3 J.-S. Lee,3 A. T. N’Diaye,4 P. Shafer,4 E. Arenholz,4 and Y. Suzuki2,5 1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA 2Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA 3Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA 4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 5Department of Applied Physics, Stanford University, Stanford, California 94305, USA (Received 11 April 2017; published 5 July 2017)