Journal
IEEE ELECTRON DEVICE LETTERS
Volume 44, Issue 5, Pages 861-864Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2023.3262666
Keywords
Magnetic tunneling; Torque; Spintronics; Microwave oscillators; Magnetic fields; Threshold current; Synchronization; Spin torque nano-oscillator; three-terminal magnetic tunnel junction; angular dependence; spin-transfer and spin-orbit torques
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Spintronic oscillators are promising candidates for neuromorphic computing due to their size, non-linearity, and synchronization properties. However, current-induced spin-transfer torque in spin torque nano-oscillators can result in high power consumption and reliability issues. Spin Hall nano-oscillators offer higher energy efficiency, but their limited power emission restricts their applications.
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.
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