Termination Effect of LSMO on Interfacial Electronic and Magnetic Properties in Alq3-Based Organic Spintronics

The interfacial regions at organic-ferromagnetic hybrid structures are critical to affect the spin injection and transport in organic spin valves (OSVs) since spin-polarized charge carriers across these interfaces. Understanding the interfacial behavers at FM-OSC-FM heterostructures is crucial for the design and operation of OSV devices. Herein, we investigated influence of different termination layers of lanthanum strontium manganite (LSMO) on the interfacial electronic and magnetic properties of LSMO/Alq₃ heterostructures. Different termination layers of LSMO with LSO, MnO₂ and mixed terminations were prepared to examine the spin interface of LSMO/Alq₃. From experimental results, the outermost layer of LSO and mixed terminations exhibited significant SrO segregation while less segregation was found for MnO₂. In addition, the surface SrO segregation correlates to the variation of surface magnetic properties and the formation of surface dipole at the mixed LMSO/Alq₃, MnO₂-ter/Alq₃, and LSO-ter/Alq₃ interfaces.