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Large planar Hall effect in perpendicularly magnetized W/CoFeB/MgO structures
조순하,박병국 한국물리학회 2015 Current Applied Physics Vol.15 No.8
The planar Hall effect (PHE) in W/CoFeB/MgO structure with perpendicular magnetic anisotropy was investigated as a function of CoFeB thickness (tCoFeB). The PHE is measured by sweeping the in-plane magnetic field at various azimuthal angles as well as by rotating strong magnetic field which is enough to saturate the magnetization. We observed a huge PHE in the W/CoFeB/MgO sample, which is even larger than anomalous Hall effect (AHE). This is distinct from the results in Ta/CoFeB/MgO samples showing a much smaller PHE than AHE. Since the PHE is insensitive to the tCoFeB while the AHE is proportional to the tCoFeB, the unprecedented PHE can be attributed to theWlayer with a large spin-orbit coupling.