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Introduction to Spin Wave Computing
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  • Abdulqader Mahmoud ,
  • Florin Ciubotaru ,
  • Frederic Vanderveken ,
  • Andrii V. Chumak ,
  • Said Hamdioui ,
  • Christoph Adelmann ,
  • Sorin Cotofana
Abdulqader Mahmoud
Delft University of Technology

Corresponding Author:[email protected]

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Florin Ciubotaru
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Frederic Vanderveken
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Andrii V. Chumak
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Said Hamdioui
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Christoph Adelmann
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Sorin Cotofana
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This paper provides a tutorial overview over recent vigorous efforts to develop computing systems based on spin waves instead of charges and voltages. Spin-wave computing can be considered as a subfield of spintronics, which uses magnetic excitations for computation and memory applications. The tutorial combines backgrounds in spin-wave and device physics as well as circuit engineering to create synergies between the physics and electrical engineering communities to advance the field towards practical spin-wave circuits. After an introduction to magnetic interactions and spin-wave physics, all relevant basic aspects of spin-wave computing and individual spin-wave devices are reviewed. The focus is on spin-wave majority gates as they are the most prominently pursued device concept. Subsequently, we discuss the current status and the challenges to combine spin-wave gates and obtain circuits and ultimately computing systems, considering essential aspects such as gate interconnection, logic level restoration, input-output consistency, and fan-out achievement. We argue that spin-wave circuits need to be embedded in conventional CMOS circuits to obtain complete functional hybrid computing systems. The state of the art of benchmarking such hybrid spin-wave--CMOS systems is reviewed and the current challenges to realize such systems are discussed. The benchmark indicates that hybrid spin-wave--CMOS systems promise ultralow-power operation and may ultimately outperform conventional CMOS circuits in terms of the power-delay-area product. Current challenges to achieve this goal include low-power signal restoration in spin-wave circuits as well as efficient spin-wave transducers.
28 Oct 2020Published in Journal of Applied Physics volume 128 issue 16. 10.1063/5.0019328