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Resonant enhancement of thermal spin-transfer torque in asymmetric double-barrier tunnel junctions
- Source :
- Superlattices and Microstructures. 109:815-820
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Charge current and thermal spin-transfer torque (TSTT) in asymmetric double-barrier magnetic tunnel junctions (DBMTJs) with a non-magnetic metal (NM) spacer as CoFeB/MgO/NM/MgO/LSMO are studied by non-equilibrium Green’s function (NEGF) formalism. It is found that the results show oscillatory behavior with an increase of the NM spacer thickness due to the resonant tunneling effect through the DBMTJs structures. About the dependence of the temperature difference and angle between the magnetizations, the charge current and TSTT are larger at the specific thicknesses (resonant positions) of the NM spacer than the others. The results also illustrate a magnitude enhancement for asymmetric DBMTJs compared with asymmetric single-barrier MTJs (SBMTJs). Therefore, it is possible to achieve a large TSTT for magnetization dynamics by new asymmetric DBMTJs.
- Subjects :
- Magnetization dynamics
Materials science
Condensed matter physics
Charge current
Spin-transfer torque
02 engineering and technology
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
Condensed Matter Physics
Double barrier
01 natural sciences
Condensed Matter::Materials Science
0103 physical sciences
Thermal
Torque
General Materials Science
Temperature difference
Electrical and Electronic Engineering
010306 general physics
0210 nano-technology
Quantum tunnelling
Subjects
Details
- ISSN :
- 07496036
- Volume :
- 109
- Database :
- OpenAIRE
- Journal :
- Superlattices and Microstructures
- Accession number :
- edsair.doi...........d3ced3d6c7e70edfdceb0a6234f691a0