Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents

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. W...

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Autores principales:	Shaik Wasef, Hossein Fariborzi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	combined spin-transfer torque (STT) and spin-orbit torque (SOT) switching field like torque damping like torque magnetic tunnel junction Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/7795583c2a9b4fd5bead2bcc7a599823
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spelling	oai:doaj.org-article:7795583c2a9b4fd5bead2bcc7a5998232021-11-25T18:23:18ZTheoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents10.3390/mi121113452072-666Xhttps://doaj.org/article/7795583c2a9b4fd5bead2bcc7a5998232021-10-01T00:00:00Zhttps://www.mdpi.com/2072-666X/12/11/1345https://doaj.org/toc/2072-666XField-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.Shaik WasefHossein FariborziMDPI AGarticlecombined spin-transfer torque (STT) and spin-orbit torque (SOT) switchingfield like torquedamping like torquemagnetic tunnel junctionMechanical engineering and machineryTJ1-1570ENMicromachines, Vol 12, Iss 1345, p 1345 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	combined spin-transfer torque (STT) and spin-orbit torque (SOT) switching field like torque damping like torque magnetic tunnel junction Mechanical engineering and machinery TJ1-1570
spellingShingle	combined spin-transfer torque (STT) and spin-orbit torque (SOT) switching field like torque damping like torque magnetic tunnel junction Mechanical engineering and machinery TJ1-1570 Shaik Wasef Hossein Fariborzi Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents
description	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.
format	article
author	Shaik Wasef Hossein Fariborzi
author_facet	Shaik Wasef Hossein Fariborzi
author_sort	Shaik Wasef
title	Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents
title_short	Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents
title_full	Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents
title_fullStr	Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents
title_full_unstemmed	Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents
title_sort	theoretical study of field-free switching in pma-mtj using combined injection of stt and sot currents
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7795583c2a9b4fd5bead2bcc7a599823
work_keys_str_mv	AT shaikwasef theoreticalstudyoffieldfreeswitchinginpmamtjusingcombinedinjectionofsttandsotcurrents AT hosseinfariborzi theoreticalstudyoffieldfreeswitchinginpmamtjusingcombinedinjectionofsttandsotcurrents
_version_	1718411266714763264

Theoretical Study of Field-Free Switching in PMA-MTJ Using Combined Injection of STT and SOT Currents

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