Proposal for a universal nonvolatile logic device based on the phase change magnetic material
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Proposal for a universal nonvolatile logic device based on the phase change magnetic material Adam Abdalla Elbashir Adam1 Received: 2 September 2020 / Accepted: 20 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Memory devices that are capable of logic functions have shown great potential in constructing non-von Neumann parallel computing architecture. Here, we proposed a universal nonvolatile logic device, utilizing the amorphous–crystalline phase transition behavior and phase change control of ferromagnetism property of Mn-doped GeTe phase change magnetic material (PCMM). The materials implication (IMP) logic in one step and sequential NAND logic were presented theoretically, based on which the functional completeness of Boolean logic could be realized. The logic operating results can be stored directly in the residual magnetization of the PCMM. This proposal may promote the design and future experimental implementation of next generation electromagnetic devices for data storage and computing. Keywords Phase change magnetic material · Materials implication · NAND · Logic-in-memory
1 Introduction Conceived by John von Neumann and other pioneers, the architecture of modern computer has achieved rapid development in the past 70 years yet within an unchanged framework, which comprises three fundamental parts: a central processing unit, a memory unit and a connecting bus that transmit the instructions and data [1–3]. However, the computation performance further improvements for big-data tasks have been severely impeded by inherent long memory access latency and limited memory bandwidth, a phenomenon known as the memory wall [3, 4]. Recently, logic-in-memory architecture, which is implementing of logic functions in memory devices, offers prospective solutions for future massive parallel computing system to overcome the memory wall [5–7]. Basic Boolean logics have been demonstrated in various nanoscale memories, including memristor, phase change random access memory (PCRAM), and magnetic memory [8–12]. In these efforts, both information logic computing and storage are performed in the same local site. The logic results are directly stored in the nonvolatile memories and can be * Adam Abdalla Elbashir Adam [email protected] 1
Faculty of Science and Technology, Alneelain University, 11121 Khartoum, Sudan
easily read out. The tight integration of processing and storage could bring intrinsic high data rates, zero static power consumption, instant-on performance, and would bridge the processor–memory gap. In various logic operation methods, particularly worth mentioning is the IMP logic, which was primarily studied by Whitehead and Russell in their 1910 masterpiece Principia Mathematica, and was regarded as a fourth fundamental logic operation while the other three AND, OR, NOT have been adopted as the basic logic functions for modern computer [13]. The notation of IMP is p → q (that is p implies q), and it means if p is true then the output is equal to q, if p is not true th
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