Critical switching current density of magnetic tunnel junction with shape perpendicular magnetic anisotropy through the combination of spin-transfer and spin-orbit torques

Recently, magnetic tunnel junctions (MTJs) with shape perpendicular magnetic anisotropy (S-PMA) have been studied extensively because they ensure high thermal stability at junctions smaller than 20 nm. Furthermore, spin-transfer torque (STT) and spin-orbit torque (SOT) hybrid switching, which guaran...

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Veröffentlicht in:Scientific reports Jg. 11; H. 1; S. 22842 - 8
Hauptverfasser: Kang, Doo Hyung, Shin, Mincheol
Format: Journal Article
Sprache:Englisch
Veröffentlicht: London Nature Publishing Group UK 24.11.2021
Nature Publishing Group
Nature Portfolio
Schlagworte:
639/766
639/766/119
639/766/119/997
Anisotropy
Asymmetry
Experiments
Humanities and Social Sciences
Magnetic fields
Magnetism
Mathematical models
multidisciplinary
Power consumption
Random access memory
Science
Science (multidisciplinary)
Symmetry
Thermal stability
ISSN:2045-2322, 2045-2322
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Zusammenfassung:Recently, magnetic tunnel junctions (MTJs) with shape perpendicular magnetic anisotropy (S-PMA) have been studied extensively because they ensure high thermal stability at junctions smaller than 20 nm. Furthermore, spin-transfer torque (STT) and spin-orbit torque (SOT) hybrid switching, which guarantees fast magnetization switching and deterministic switching, has recently been achieved in experiments. In this study, the critical switching current density of the MTJ with S-PMA through the interplay of STT and SOT was investigated using theoretical and numerical methods. As the current density inducing SOT ( J SOT ) increases, the critical switching current density inducing STT ( J STT,c ) decreases. Furthermore, for a given J SOT , J STT,c increases with increasing thickness, whereas J STT,c decreases as the diameter increases. Moreover, J STT,c in the plane of thickness and spin-orbit field-like torque ( β ) was investigated for a fixed J SOT and diameter. Although J STT,c decreases with increasing β , J STT,c slowly increases with increasing thickness and increasing β . The power consumption was investigated as a function of thickness and diameter at the critical switching current density. Experimental confirmation of these results using existing experimental techniques is anticipated.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-02185-3