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Tuning Magnetic Coupling in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>IrO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Thin Films with Epitaxial Strain
We report x-ray resonant magnetic scattering and resonant inelastic x-ray scattering studies of epitaxially strained ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ thin films. The films were grown on ${\mathrm{SrTiO}}_{3}$ and $({\mathrm{LaAlO}}_{3}{)}_{0.3}({\mathrm{Sr}}_{2}{\mathrm{AlTaO}}_{6}{)}_{0.7}$ substrates, under slight tensile and compressive strains, respectively. Although the films develop a magnetic structure reminiscent of bulk ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$, the magnetic correlations are extremely …