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We report the generation and detection of spin-orbit torque ferromagneticresonance (STFMR) in micropatterned epitaxial Fe/Pt bilayers grown by molecularbeam epitaxy. The magnetic field dependent measurements at an in-plane magneticfield angle of 45 degrees with respect to the microwave-current directionreveal the presence of two distinct voltage peaks indicative of a strongmagnetic anisotropy. We show that STFMR can be employed to probe the underlyingmagnetic properties including the anisotropies in the Fe layer. We compare ourSTFMR results with broadband ferromagnetic resonance spectroscopy of theunpatterned bilayer thin films. The experimental STFMR measurements areinterpreted using an analytical formalism and further confirmed usingmicromagnetic modeling, which shed light on the field-dependent magnetizationalignment in the microstructures responsible for the STFMR rectification. Ourresults demonstrate a simple and efficient method for determining magneticanisotropies in microstructures by means of rf spectroscopy.

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