Large planar Hall effect in perpendicularly magnetized W/CoFeB/MgO structures

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The planar Hall effect (PHE) in W/CoFeB/MgO structure with perpendicular magnetic anisotropy was investigated as a function of CoFeB thickness (t(CoFeB)). 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 t(CoFeB) while the AHE is proportional to the t(CoFeB), the unprecedented PHE can be attributed to the W layer with a large spin-orbit coupling.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2015-08
Language
English
Article Type
Article
Keywords

SPIN-TORQUE; DOMAIN-WALLS; ANISOTROPY; LAYER

Citation

CURRENT APPLIED PHYSICS, v.15, no.8, pp.902 - 905

ISSN
1567-1739
DOI
10.1016/j.cap.2015.04.002
URI
http://hdl.handle.net/10203/200076
Appears in Collection
MS-Journal Papers(저널논문)
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