Introduction to Spin Wave Computing
preprintposted on 2021-09-13, 18:55 authored by Abdulqader MahmoudAbdulqader Mahmoud, Florin Ciubotaru, Frederic Vanderveken, Andrii V. Chumak, Said Hamdioui, Christoph Adelmann, Sorin Cotofana
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.
This work has been funded by the European Union’s Horizon 2020 research and innovation program within the FET-OPEN project CHIRON under grant agreement No.~801055. It has also been partially supported by imec’s industrial affiliate program on beyond-CMOS logic. F.V. acknowledges financial support from the Research Foundation –- Flanders (FWO) through grant No.~1S05719N. A.V.C. acknowledges financial support from the European Research Council within the Starting Grant No.~678309, MagnonCircuits.
Email Address of Submitting Authorabdulqader.firstname.lastname@example.org
ORCID of Submitting Author0000-0002-7507-5993
Submitting Author's InstitutionDelft University of Technology
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