Perovskite oxides for spin pumping

Resonant excitation of magnetic films is an attractive source of pure spin current for spintronics applications. Exploiting this spin pumping effect in heterostructures of transition metal oxides, with tunable spin-charge-orbital degrees of freedom, could lead to novel physical probes of these materials and new operational regimes for spintronics devices. Atomically precise interfaces are now readily obtained, which could help advance understanding of interfacial spin transport. Using pulsed laser deposition, we have fabricated heterostructures of epitaxial oxides incorporating candidate high-spin orbit materials, in order to understand the potential phase space for interfacial spin transport in oxide materials. One promising group is the Ruddlesden-Popper series of perovskite iridates, which can now be thermodynamically stabilized in the ultrathin limit. Metallic Co, Cu and Pt have been incorporated into our samples by electron beam evaporation performed in-situ, without breaking vacuum. We will report our results on ferromagnetic resonance, damping and magnetic anisotropy.