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Inplane magnetization reversal of a permalloy/platinum bilayer was detectedusing the spin rectification effect. Using a sub GHz microwave frequency toexcite spin torque ferromagnetic resonance (ST FMR) in the bilayer induces twodiscrete DC voltages around an external static magnetic field of 0 mT. Thesediscrete voltages depend on the magnetization directions of the permalloy andenable detection of the inplane magnetization reversal. The threshold currentdensity for the magnetization reversal is from 10 to 20 MA/cm^2, the same orderas for known spin orbit torque (SOT) switching with in-plane magnetizationmaterials. The magnitude of the signal is the same or larger than that of thetypical ST FMR signal; that is, detection of magnetization switching is highlysensitive in spite of deviation from the optimal ST-FMR condition. The proposedmethod is applicable to a simple device structure even for a smallferromagnetic electrode with a width of 100 nm.

Inplane spin orbit torque magnetization switching and its detection using the spin rectification effect at sub-GHz frequencies