Influence of an atomistic protrusion at the tip apex on enhancing molecular emission in tunnel junctions: A theoretical study

2021 ◽  
Vol 154 (21) ◽  
pp. 214706
Author(s):  
Jia-Zhe Zhu ◽  
Gong Chen ◽  
Talha Ijaz ◽  
Xiao-Guang Li ◽  
Zhen-Chao Dong
Keyword(s):  
Theoretical Study ◽  
Tunnel Junctions ◽  
Molecular Emission

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

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1345
Author(s):  
Shaik Wasef ◽  
Hossein Fariborzi
Keyword(s):  
Critical Current ◽  
Theoretical Study ◽  
Tunnel Junctions ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Orbit ◽  
Micromagnetic Simulations ◽  
Spintronic Devices ◽  
Current Densities ◽  
The Relationship

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.

A theoretical study of magnetoelectronic and switching properties of molecular magnetic tunnel junctions

2016 ◽  
Vol 30 (04) ◽  
pp. 1650017
Author(s):  
V. Soti ◽  
B. Abedi Ravan
Keyword(s):  
Electronic Transport ◽  
First Principles ◽  
Density Functional ◽  
Theoretical Study ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Switching Behavior ◽  
Functional Theory ◽  
Spintronic Devices ◽  
Ferromagnetic Electrodes

Electronic transport and switching properties of molecule-based magnetic tunnel junctions are investigated using the first-principles density functional theory and non-equilibrium Green function methods. As a result of being sandwiched between the ferromagnetic electrodes, a spin-polarization is induced in the nonmagnetic organic atoms. Magnitudes of the spin-polarizations in the trans-polyacetylene, cis-polyacetylene, terphenyl and pentacene chains are calculated and it is suggested that among these the pentacene molecules, because of showing a relatively higher magnetization can theoretically be more appropriate for utilization in spintronic devices. Furthermore, electrical switching capabilities of the junctions are studied and the results reveal that the pentacene junction due to having a larger ON/OFF ratio shows a better switching behavior. Finally, magnetoresistive properties are studied and it is shown that applying torsion can be an effective method to enhance and also adjust magnitudes of the magnetoresistances of the junctions.

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