L'abstract è  presente nell'allegato / the abstract is in the attachmen

GNOLI, LUCA

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L'abstract è  presente nell'allegato / the abstract is in the attachmen

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16 July 2022POLITECNICO DI TORINORepository ISTITUZIONALEExploring logic-in-memory architectures with skyrmion technology / Gnoli, Luca. - (2021 Nov 18), pp. 1-164.OriginalExploring logic-in-memory architectures with skyrmion technologyPublisher:PublishedDOI:Terms of use:Altro tipo di accessoPublisher copyright(Article begins on next page)This article is made available under terms and conditions as specified in the  corresponding bibliographic description inthe repositoryAvailability:This version is available at: 11583/2945181 since: 2021-12-14T12:20:26ZPolitecnico di TorinoDoctoral Program in Electronic Engineering (33.th cycle)Exploring logic-in-memory architectures with skyrmion technologyAuthor: Luca GnoliSummaryFrom their experimental verification in 2009 magnetic skyrmions attracted greatinterest thanks to many intriguing characteristics that this magnetic texture has.Their small dimension suggested a possible application in high density data storage.Their stability and the chance to be moved with low current densities compared withother textures suggested their use as successors of domain walls in racetrack mem-ories. In addition their rich dynamics linked to current stimulus, opened the doorto many other applications, starting from boolean logic circuits up to non-booleancomputation devices. The vast majority of research on applications of skyrmiontechnology focused its attention on the proposal of single devices, studying basiclogic functions to demonstrate the feasibility of logic with skyrmion technology.At the same time, the study of complex systems based on this technology is stilllacking, only few examples in literature have been presented. For other technolo-gies, both electric and magnetic, an important step in their evolution has beenthe study of the challenges and possibilities that arise from the implementation oflogic systems able to solve complex problems. The design of a complex system,indeed, permits to better appreciate the strength of a technology but also to revealpossible drawbacks linked to circuit integration. Moreover, the realization of thesesystems is useful on one side to have a comparison with already tested and knowntechnologies and on the other to shed light on the design challenges that might ap-pear implementing complex circuits in a specific technology. The presented thesishas the goal to address this issue for skyrmion technology, providing a wider viewon skyrmion systems. The thesis starts from the study of possible strategies forcomplex circuit design, based on skyrmions and later proposes designs in skyrmiontechnology with increasing complexity. In particular, the design proposals, focuseson logic in memory architectures. Skyrmions are indeed a promising memory tech-nology. This aspect, together with the possibility to realize logic functions, suggestsa preferable application in architectures that embeds both non-volatile memory andlogic. Finally, another way to design magnetic circuits employing skyrmion technol-ogy has been explored. The proposal done in the last chapter is based on a circuitistructure in which different magnetic technologies can successfully communicateand realize different tasks. This connection allows to design circuits in which dif-ferent operations of the algorithm are accomplished by different technologies, eachone optimized for its own application. The proposal in particular focuses on thedemonstration of the interface used to put in communication Perpendicular Nano-magnetic Logic and Skyrmion technology. In the proposed interface the skyrmiontechnology, that is the memory technology, can pass the information stored in formof skyrmion to perpendicular nanomagnetic logic that realize the logic part of thecircuit. The opposite conversion is also demonstrated: the information comingfrom the Perpendicular Nanomagnetic Logic is translated in skyrmion form to bestored back in memory. This direct interface between the two technologies opensinteresting scenarios in which magnetic logic can potentially access with very highbandwidth the magnetic storage without any electrical conversion needed.ii

Exploring logic-in-memory architectures with skyrmion technology

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Exploring logic-in-memory architectures with skyrmion technology

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