Power and phase profiles in nano-constriction based synchronized spin hall nano-oscillators near threshold current
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Accepted Version
Date
2023-09-04
Authors
Ronayne, William
Samanta, Arindam
Amann, Andreas
Roy, Saibal
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Publisher
Institute of Electrical and Electronics Engineers (IEEE)
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Abstract
Spin Hall nano-oscillators (SHNOs) demonstrate self-sustained magnetization auto-oscillations, that have recently received much attention due to their potential for cutting-edge applications. In this work, the power and phase profiles, i.e., the complex quantized propagation dynamics of nano-constriction-based spin hall nano-oscillators (SHNOs) near the threshold current have been investigated. The SHNO generates a 12 GHz microwave frequency upon application of 2 mA direct current in presence of a 0.6 T external bias magnetic field. Power profile reveals that spin wave (SW) modes are quantized along x-axis. The phase profile reveals a complex nature of the SW modes at the dominant frequency (mostly localised at the nano-constriction region and additionally propagates from centre to the edges). Whereas SW mode of other frequencies mostly propagate towards the edge from the central nano-constriction region having a complex spiral nature. The SHNO devices, which are operational at high-frequencies, can be useful in energy-efficient tuneable microwave oscillators and neuromorphic computing.
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Keywords
Ferromagnetic (FM)/non-magnetic heavy metal (HM) bilayer heterostructures , Micromagnetic simulation , Neuro-morphic computing , Spin-orbit coupling (SOC) , Spin hall nano-oscillator (SHNO) , Spin wave (SW) , Synchronization
Citation
Ronayne, W., Samanta, A., Amann, A. and Roy, S. (2023) 'Power and phase profiles in nano-constriction based synchronized spin hall nano-oscillators near threshold current', 2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers), Sendai, Japan, 15-19 May, pp. 1-2. doi: 10.1109/INTERMAGShortPapers58606.2023.10228501.
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