Giant voltage-controlled modulation of spin Hall nano-oscillator damping

Himanshu Fulara (), Mohammad Zahedinejad, Roman Khymyn, Mykola Dvornik, Shunsuke Fukami, Shun Kanai, Hideo Ohno and Johan Åkerman ()
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Himanshu Fulara: University of Gothenburg
Mohammad Zahedinejad: University of Gothenburg
Roman Khymyn: University of Gothenburg
Mykola Dvornik: University of Gothenburg
Shunsuke Fukami: Tohoku University
Shun Kanai: Tohoku University
Hideo Ohno: Tohoku University
Johan Åkerman: University of Gothenburg

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-17833-x

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