Intrinsically strained hexagonal Sr0.6Ba0.4MnO3 oxygen partial pressure dependent texturing and weak ferromagnetic behavior

•Stoichiometric hexagonal Sr0.6Ba0.4MnO3 films are grown.•Raman spectroscopy indicates towards octahedral distortion due to strain.•Weak ferromagnetic behavior is observed at room temperature with high TC.•XMCD measurement confirms weak ferromagnetism at room temperature.•Orbital moment is unquenched and has significant contribution in magnetization.