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arXiv · 2403.13478

Ultrahigh Frequency and Multi-channel Output in Skyrmion Based Nano-oscillator

Abhishek Sharma·Saumya Gupta·Debasis Das·Ashwin. A. Tulapurkar·Bhaskaran Muralidharan
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Abstract

Spintronic nano-oscillators can generate tunable microwave signals that find a wide range of applications in the field of telecommunication to modern neuromorphic computing systems. Among other spintronic devices, a magnetic skyrmion is a promising candidate for the next generation of low-power devices due to its small size and topological stability. In this work, we propose a multi-channel oscillator design based on the synthetic anti-ferromagnetic (SAF) skyrmion pair. The mitigation of the skyrmion Hall effect in SAF and the associated decimation of the Magnus force endows the proposed oscillator with an ultra-high frequency of 41GHz and a multi-channel frequency output driven by the same current. The ultrahigh operational frequency represents an $\sim$342 times improvement compared to the monolayer single skyrmion oscillator featuring a constant uniaxial anisotropy profile. Using micromagnetic simulations, we demonstrate the effectiveness of our proposed multi-channel oscillator design by introducing multi-channel nanotracks along with multiple skyrmions for enhanced frequency operation. The ultrahigh operational frequency and multi-channel output are attributed to three key factors: The oscillator design accounting for a finite spin-flip length of the spacer (such as Ru) material, tangential velocity proportionality on input spin current along with weak dependence on the radius of rotation of the skyrmion-pair, skyrmion interlocking in the channel enabled by the multi-channel high Ku rings and skyrmion-skyrmion repulsion, therefore resulting ultrahigh frequency and multi-channel outputs.

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Abhishek Sharma, Saumya Gupta, Debasis Das, Ashwin. A. Tulapurkar, Bhaskaran Muralidharan. 2024-03-20. Ultrahigh Frequency and Multi-channel Output in Skyrmion Based Nano-oscillator. https://arxiv.org/abs/2403.13478

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