Magnetic interactions at the nanoscale in trilayer titanates LaTiO${}_3$/SrTiO${}_3$/YTiO${}_3$

Abstract

We report on the phase diagram of competing magnetic interactions at nanoscale in engineered ultra-thin trilayer heterostructures of LaTiO${}_3$/SrTiO${}_3$/YTiO${}_3$, in which the interfacial inversion symmetry is explicitly broken. Combined atomic layer resolved scanning transmission electron microscopy with electron energy loss spectroscopy and electrical transport have confirmed the formation of a spatially separated two-dimensional electron liquid and high density two-dimensional localized magnetic moments at the LaTiO${}_3$/SrTiO${}_3$ and SrTiO${}_3$/YTiO${}_3$ interfaces, respectively. Resonant soft X-ray linear dichroism spectroscopy has demonstrated the presence of orbital polarization of the conductive LaTiO${}_3$/SrTiO${}_3$ and localized SrTiO${}_3$/YTiO${}_3$ electrons. Our results provide a route with prospects for exploring new magnetic interfaces, designing tunable two-dimensional $d$-electron Kondo lattice, and potential spin Hall applications.

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Cited by in corpus (9)

• Artificial two-dimensional polar metal at room temperature
• Anomalous orbital structure in a spinel-perovskite interface $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$
• Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering
• Evolution of ferromagnetism in two-dimensional electron gas of LaTiO3/SrTiO3
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• Metallic interfaces in a CaTiO${}_3$/LaTiO${}_3$ heterostructure