Magnetic Interactions at the Nanoscale in Trilayer Titanates

Yanwei Cao, Zhenzhong Yang, M. Kareev, Xiaoran Liu, D. Meyers, S. Middey, D. Choudhury, P. Shafer, Jiandong Guo, J. W. Freeland, E. Arenholz, Lin Gu, Jak Chakhalian

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Abstract

We report on the phase diagram of competing magnetic interactions at the nanoscale in engineered ultrathin trilayer heterostructures of LaTiO3/SrTiO3/YTiO3, 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 LaTiO3/SrTiO3 and SrTiO3/YTiO3 interfaces, respectively. Resonant soft x-ray linear dichroism spectroscopy has demonstrated the presence of orbital polarization of the conductive LaTiO3/SrTiO3 and localized SrTiO3/YTiO3 electrons. Our results provide a route with prospects for exploring new magnetic interfaces, designing a tunable two-dimensional d-electron Kondo lattice, and potential spin Hall applications.

Original languageEnglish (US)
Article number076802
JournalPhysical review letters
Volume116
Issue number7
DOIs
StatePublished - Feb 17 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Cao, Y., Yang, Z., Kareev, M., Liu, X., Meyers, D., Middey, S., Choudhury, D., Shafer, P., Guo, J., Freeland, J. W., Arenholz, E., Gu, L., & Chakhalian, J. (2016). Magnetic Interactions at the Nanoscale in Trilayer Titanates. Physical review letters, 116(7), [076802]. https://doi.org/10.1103/PhysRevLett.116.076802