Phase-Binarized Spin Hall Nano-Oscillator Arrays: Towards Spin Hall Ising Machines
Afshin Houshang,Mohammad Zahedinejad,Shreyas Muralidhar,Roman Khymyn,Mona Rajabali,Himanshu Fulara,Ahmad A. Awad,Johan Åkerman,Jakub Chęciński,Mykola Dvornik +9 more
TLDR
In this paper , the authors demonstrate a pathway towards an oscillator-based IM using arrays of nanoconstriction spin Hall nano-oscillators (SHNOs) and show how SHNOs can be readily phase binarized and how their resulting microwave power corresponds to well defined global phase states.Abstract:
Ising machines (IMs) are physical systems designed to find solutions to combinatorial optimization (CO) problems mapped onto the IM via the coupling strengths between its binary spins. Using its intrinsic dynamics and different annealing schemes, the IM relaxes over time to its lowest-energy state, which is the solution to the CO problem. IMs have been implemented on different platforms, and interacting nonlinear oscillators are particularly promising candidates. Here we demonstrate a pathway towards an oscillator-based IM using arrays of nanoconstriction spin Hall nano-oscillators (SHNOs). We show how SHNOs can be readily phase binarized and how their resulting microwave power corresponds to well-defined global phase states. To distinguish between degenerate states, we use phase-resolved Brillouin-light-scattering microscopy and directly observe the individual phase of each nanoconstriction. Micromagnetic simulations corroborate our experiments and confirm that our proposed IM platform can solve CO problems, showcased by how the phase states of a $2\ifmmode\times\else\texttimes\fi{}2$ SHNO array are solutions to a modified max-cut problem. Compared with the commercially available D-Wave ${\mathrm{Advantage}}^{\mathrm{TM}}$, our architecture holds significant promise for faster sampling, substantially reduced power consumption, and a dramatically smaller footprint. read more
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Quantum materials for energy-efficient neuromorphic computing: Opportunities and challenges
Axel Hoffmann,Shriram Ramanathan,Julie Grollier,Andrew D. Kent,Marcelo J. Rozenberg,Ivan K. Schuller,Oleg Shpyrko,Robert C. Dynes,Yeshaiahu Fainman,Alex Frano,Eric E. Fullerton,Giulia Galli,Vitaliy Lomakin,Shyue Ping Ong,Amanda K. Petford-Long,Jon A. Schuller,Mark D. Stiles,Yayoi Takamura,Yimei Zhu +18 more
TL;DR: This Perspective discusses select examples of quantum-material-based devices for neuromorphic functionalities into larger emergent complex network systems and provides an outlook on the current opportunities and challenges.
Journal ArticleDOI
Fabrication of voltage-gated spin Hall nano-oscillators
TL;DR: In this article , an optimized fabrication process for electric field (voltage gate) controlled nano-constriction spin Hall nano-oscillators (SHNOs), achieving feature sizes of <30 nm with easy to handle ma-N 2401 e-beam lithography negative tone resist.
Journal ArticleDOI
Ultrathin Ferrimagnetic GdFeCo Films with Low Damping
TL;DR: In this paper , a nearly compensated behavior is observed in 2 nm Gdx(Fe87.5Co12.5)1−x thin films in the thickness range t = 2-20 nm.
Journal ArticleDOI
Energy-Efficient <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mi mathvariant="normal">W</mml:mi><mml:mrow><mml:mn>100</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ta</mml:mi><mml:mi>x</mml:mi></mml:
Nilamani Behera,Himanshu Fulara,Lakhan Bainsla,Akash Kumar,Mohammad Zahedinejad,Afshin Houshang,Johan Åkerman +6 more
TL;DR: In this paper , a W-Ta alloying route was investigated to reduce the auto-oscillation current densities and the power consumption of nano-constriction based spin Hall nano oscillators.
Journal ArticleDOI
Optothermal control of spin Hall nano-oscillators
TL;DR: In this paper , the authors investigate the impact of localized laser heating on the auto-oscillation properties of a 170 nm wide nano-constriction spin Hall nano-oscillators (SHNOs) fabricated from a NiFe/Pt bilayer on a sapphire substrate.
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