Isotropic orbital magnetic moments in magnetically anisotropic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrRuO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> films

Epitaxially strained SrRuO3 films have been a model system for understanding the magnetic anisotropy in metallic oxides. In this paper, we investigate of Ru 4d and O 2p electronic structure properties using high-quality epitaxially (compressive tensile) grown by machine-learning-assisted molecular beam epitaxy. The element-specific hybridization between orbitals were characterized M2,3-edge K-edge soft X-ray absorption spectroscopy circular dichroism measurements. magnetization curves moments are identical, irrespective strain type, indicating strong coupling ions. orbital moment relative to spin isotropic despite perpendicular in-plane compressive-strained tensile-strained films; i.e., negligibly small contribution anisotropy. This result contradicts Bruno model, where arises from difference directions. Contributions strain-induced electric quadrupole discussed, too.