TY - JOUR
T1 - Giant voltage-controlled modulation of spin Hall nano-oscillator damping
AU - Fulara, Himanshu
AU - Zahedinejad, Mohammad
AU - Khymyn, Roman
AU - Dvornik, Mykola
AU - Fukami, Shunsuke
AU - Kanai, Shun
AU - Ohno, Hideo
AU - Åkerman, Johan
N1 - Funding Information:
This work was partially supported by the Horizon 2020 research and innovation program (ERC Advanced Grant No. 835068 “TOPSPIN”). This work was also partially supported by the Swedish Research Council (VR) and the Knut and Alice Wallenberg Foundation. Open access funding provided by University of Gothenburg. The work at Tohoku University was supported by JSPS Kakenhi 17H06093 and 19H05622.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - Spin Hall nano-oscillators (SHNOs) are emerging spintronic devices for microwave signal generation and oscillator-based neuromorphic computing combining nano-scale footprint, fast and ultra-wide microwave frequency tunability, CMOS compatibility, and strong non-linear properties providing robust large-scale mutual synchronization in chains and two-dimensional arrays. While SHNOs can be tuned via magnetic fields and the drive current, neither approach is conducive to individual SHNO control in large arrays. Here, we demonstrate electrically gated W/CoFeB/MgO nano-constrictions in which the voltage-dependent perpendicular magnetic anisotropy tunes the frequency and, thanks to nano-constriction geometry, drastically modifies the spin-wave localization in the constriction region resulting in a giant 42% variation of the effective damping over four volts. As a consequence, the SHNO threshold current can be strongly tuned. Our demonstration adds key functionality to nano-constriction SHNOs and paves the way for energy-efficient control of individual oscillators in SHNO chains and arrays for neuromorphic computing.
AB - Spin Hall nano-oscillators (SHNOs) are emerging spintronic devices for microwave signal generation and oscillator-based neuromorphic computing combining nano-scale footprint, fast and ultra-wide microwave frequency tunability, CMOS compatibility, and strong non-linear properties providing robust large-scale mutual synchronization in chains and two-dimensional arrays. While SHNOs can be tuned via magnetic fields and the drive current, neither approach is conducive to individual SHNO control in large arrays. Here, we demonstrate electrically gated W/CoFeB/MgO nano-constrictions in which the voltage-dependent perpendicular magnetic anisotropy tunes the frequency and, thanks to nano-constriction geometry, drastically modifies the spin-wave localization in the constriction region resulting in a giant 42% variation of the effective damping over four volts. As a consequence, the SHNO threshold current can be strongly tuned. Our demonstration adds key functionality to nano-constriction SHNOs and paves the way for energy-efficient control of individual oscillators in SHNO chains and arrays for neuromorphic computing.
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U2 - 10.1038/s41467-020-17833-x
DO - 10.1038/s41467-020-17833-x
M3 - Article
C2 - 32782243
AN - SCOPUS:85089285304
SN - 2041-1723
VL - 11
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 4006
ER -