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Redox-controlled epitaxy and magnetism of oxide heterointerfaces: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>EuO</mml:mi><mml:mo>/</mml:mo><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
We demonstrate a novel route to prepare thin films of the ferromagnetic insulator Europium monoxide. Key is a redox-controlled interface reaction between metallic Eu and the substrate SrTiO$_3$ as the supplier of oxygen. The process allows tuning the electronic, magnetic and structural properties of the EuO films. Furthermore, we apply …