Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents
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ArticleAuthors
Wasef, ShaikFariborzi, Hossein

KAUST Department
Computer, Electrical and Mathematical Science and Engineering (CEMSE) DivisionElectrical and Computer Engineering Program
Date
2021-10-31Submitted Date
2021-08-28Permanent link to this record
http://hdl.handle.net/10754/673076
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Field-free switching in perpendicular magnetic tunnel junctions (P-MTJs) can be achieved by combined injection of spin-transfer torque (STT) and spin-orbit torque (SOT) currents. In this paper, we derived the relationship between the STT and SOT critical current densities under combined injection. We included the damping–like torque (DLT) and field-like torque (FLT) components of both the STT and SOT. The results were derived when the ratio of the FLT to the DLT component of the SOT was positive. We observed that the relationship between the critical SOT and STT current densities depended on the damping constant and the magnitude of the FLT component of the STT and the SOT current. We also noted that, unlike the FLT component of SOT, the magnitude and sign of the FLT component of STT did not have a significant effect on the STT and SOT current densities required for switching. The derived results agreed well with micromagnetic simulations. The results of this work can serve as a guideline to model and develop spintronic devices using a combined injection of STT and SOT currents.Citation
Wasef, S., & Fariborzi, H. (2021). Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents. Micromachines, 12(11), 1345. doi:10.3390/mi12111345Sponsors
This research received no external funding.Publisher
MDPI AGJournal
MicromachinesAdditional Links
https://www.mdpi.com/2072-666X/12/11/1345ae974a485f413a2113503eed53cd6c53
10.3390/mi12111345
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