Probing anisotropy in epitaxial Fe/Pt bilayers by spin–orbit torque ferromagnetic resonance

We report the generation and detection of spin–orbit torque ferromagnetic resonance (STFMR) in micropatterned epitaxial Fe/Pt bilayers grown by molecular beam epitaxy. The magnetic field dependent measurements at an in-plane angle 45° with respect to microwave-current direction reveal presence two distinct voltage peaks indicative a strong anisotropy. show that STFMR can be employed probe underlying properties, including anisotropies Fe layer. compare our results broadband spectroscopy magneto-optical Kerr effect unpatterned bilayer thin films. experimental are interpreted using analytical formalism further confirmed micromagnetic modeling which sheds light on field-dependent magnetization alignment microstructures responsible for rectification. Our demonstrate simple efficient method determining means rf spectroscopy.