Magnetic properties of Manganite/Iridate bilayers*

The relationship between spin-orbit coupling (SOC), emergent topological states, and spin Hall effects, which are highly relevant for spintronics, has driven the recent interest in materials with strong SOC. To probe the influence of SOC at 3d-5d complex oxide interfaces, we have investigated ferromagnetic La_0.7Sr_0.3MnO₃/SrIrO₃ bilayers deposited on SrTiO₃. We find that depending on the growth order, the coercive field of the magnetization loop differs significantly at low temperatures. Similar to previous reports, a net moment on Ir has been recorded with element specific XMCD experiments, which is aligned antiparallel to the Mn moments within the manganite. We find that the Ir moment does not follow the same temperature dependence as the magnetization of the manganite, and is limited to the interface. The origins and implications of this result will be discussed.