Spin-Orbit Torque-Driven Magnetic Switching of Co/Pt-CoFeB Exchange Sping Ferromagnets

Title
Spin-Orbit Torque-Driven Magnetic Switching of Co/Pt-CoFeB Exchange Sping Ferromagnets
Authors
이억재Min SongShijiang LuoXin LiShuai ZhangQiang LuoZhe GuoJeongmin HongBin ZhouHaoshuang GuLong You
Keywords
spin orbit torque; MRAM; spin orbit coupling; PMA
Issue Date
2019-08
Publisher
IEEE transactions on magnetics
Citation
VOL 55, NO 8-1401004-4
Abstract
We experimentally investigate spin– orbit torque (SOT) switching of a hybrid exchange spring system (ESS) in which a Co/Pt with perpendicular magnetic anisotropy (PMA) is coupled to a CoFeB thin film with an in-plane (IP) magnetic anisotropy (IMA). The magnetization tilt angle from the out-of-plane can be easily tuned by varying the thickness of the IMA layer due to the competition between PMA and IMA layers. We find that the tilt angle is highly tuned from 0° to 90° over a small range of CoFeB thicknesses, from 0 to 1 nm. The tilted films with high thermal stability are promising materials for a zero/low field operating SOT magnetic random access memory (MRAM) or for a bit patterned magnetic recording media. IP current-induced magnetization switching of Co/Pt-CoFeB ESS is also studied, under an IP magnetic field (HIP). The current amplitude for the 45° tilt magnetization switching is almost independent of the HIP ranged from 50 to 1000 Oe. This phenomenon might be due to the presence of the Dzyaloshinskii– Moriya interaction (DMI) and DMI effective field is expected to be less than 50 Oe.
URI
http://pubs.kist.re.kr/handle/201004/69840
ISSN
0018-9464
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KIST Publication > Article
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