Angular Dependent Auto-Oscillations by Spin-Transfer and Spin-Orbit Torques in Three-Terminal Magnetic Tunnel Junctions

Spintronic oscillators are promising candidates for neuromorphic computing due to their true miniaturization, non-linearity and synchronization properties. However, spin torque nano-oscillators are excited by current-induced spin-transfer torque which may cause high power consumption and reliability problems. Spin Hall nano-oscillators can realize higher energy efficiency, while their relatively low power emission limits their further applications. Here, we demonstrate three-terminal magnetic tunnel junction based spin torque nano-oscillators excited by the combination of spin-transfer and spin-orbit torques under different angle configurations. Thanks to the large spin Hall angle (-0.278) of W, the ratio between threshold current density of spin-transfer and spin-orbit torques for auto-oscillations can reach 0.6, indicating their high energy efficiency. Furthermore, we observe that the ratio has a sine function dependence on the angle between the spin-polarization directions of spin-transfer and spin-orbit torques. Our work could benefit the development of high-efficiency spintronic oscillators and their large network designs.

Kumar, AkashGothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:gu)xkumak (författare)
Du, A. (författare)
Shi, K. W. (författare)
Xiao, R. (författare)
Cao, K. H. (författare)
Yin, J. L. (författare)
Åkerman, Johan,1970Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:gu)xkerjo (författare)
Zhao, W. S. (författare)
Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)

Ingår i:Ieee Electron Device Letters: Institute of Electrical and Electronics Engineers (IEEE)44:5, s. 861-8640741-31061558-0563

Av författaren/redakt...: Cai, W. L.; Kumar, Akash; Du, A.; Shi, K. W.; Xiao, R.; Cao, K. H.; visa fler...; Yin, J. L.; Åkerman, Johan, ...; Zhao, W. S.; visa färre...

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