November 9, 2025Open Access

Dirac semimetal strontium iridate thin films with strong spin-orbit interaction for magnetic heterostructures

GOG. A. OvsyannikovInstitute of Radio-Engineering and Electronics NDN. V. DubitskiyMIREA - Russian Technological University GUG. D. UlevMoscow Institute of Physics and Technology

Key Points

Thin films demonstrated significant spin-orbit interaction, enhancing electron transport properties in heterostructures.
X-ray photoelectron spectroscopy revealed crucial insights into the film characteristics at various temperatures.
Analysis of substrates, including SrTiO3 and NdGaO3, illustrated the impact of lattice mismatch on film performance.
These findings suggest further exploration of strontium iridate may enable new advancements in spintronic applications.

Abstract

The structural crystal features, electron transport and magnetotransport of the epitaxial strontium iridate (SrIrO₃) and iridate/manganite SrIrO₃/La₀. ₇Sr₀. ₃MnO₃ heterostructure have been investigated. The influence of epitaxial strain relaxation caused by the lattice mismatch between SrIrO₃ films and five substrates: SrTiO₃, NdGaO₃, (LaAlO₃) ₀. ₃ (Sr₂TaAlO₆) ₀. ₇, LaAlO₃, and Pb (Mg₁/₃Nb₂/₃) O₃-PbTiO₃ on electron and magnetic transport has been observed. A pronounced impact of strong spin-orbit interaction on characteristics of SrIrO₃ films has been revealed by means of X-ray photoelectron spectroscopy, magnetoresistance and Hall-resistance measurements at temperatures T = 2-300 K. These findings highlight the tunability of spin-orbit-driven transport phenomena in strain-controlled SrIrO₃-based epitaxial systems, relevant for future spintronic oxide heterostructures. The contribution of Kondo scattering on temperature dependence of SrIrO₃ films resistance was observed.

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