Compact SPICE Model of Topological Textures on Magnetic Racetracks for Design Space Exploration

Sakib, Mohammad Nazmus; Vakili, Hamed; Ganguly, Samiran; Stan, Mircea R.; Ghosh, Avik W.; Brown, Charles L.

doi:10.1109/sispad54002.2021.9592575

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…[11][12][13][14] This approach has been since expanded to include a wider variety of non-electrical state variables including memristive phase fronts, optoelectronic devices, and magnetic topological structures. 15 Many of the existing modules can fairly be claimed to model quantum systems and technology; the present work extends this devices of interest to quantum sensing and computing, specifically qubit technology. We discuss modeling of Josephson Junctions and a scheme to simulate topological quantum computing operations on Majorana Zero Modes from within existing EDA, and end with discuss how large qubit collections may be simulated from SPICE with external co-simulation with a dedicated quantum information science (QIS) simulator.…”

Section: Introductionmentioning

confidence: 89%

“…For a computing or memory device simulation perspective, the exact texture and microscopic details do not matter. Therefore we model 15 the skyrmion in the state variable: E, where E is existence and L is the location. In our approach E is stored on a capacitor (a memory cell) that is driven by skyrmion's creation event, L is obtained by integrating the equation of motion L = L 0 dx = T 0 µIdt, through a controlled current -capacitor network.…”

Section: Magnetic Topological Textures: Skyrmionsmentioning

confidence: 99%

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Circuits and systems modeling of quantum systems in SPICE

Ganguly¹,

Ghosh

Dhar

2023

Quantum Information Science, Sensing, and Computation XV

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Quantum systems are entering a crucial stage of technology development where it is critical that design automation tools are co-developed along with the technology itself. Electronics design ecosystem provides tools which may be extended towards simulation and verification, critical steps towards large-scale certifiable designs of such quantum systems. SPICE simulations provide an appropriate level of abstraction that is both physical, in terms of custom designed physical components, and simulation approach, i.e. differential-algebraic equations. In this work we describe our efforts in modeling quantum + classical systems within SPICE. We first present our highly successful spintronics platform that has allowed us to model a multitude of spintronic effects including transport in tunnel-junctions, full lifecycle of quasi-quantum topological objects such as skyrmions, and transport in topological materials (TI, Weyl Semimetals). We demonstrate the extension of this platform towards simulations of circuits built using spin-qubits made from Josephson junctions, and a more emergent platform of Majorana Zero Modes (MZMs). We describe our approach that allows us to abstract away microscopic details, while capturing device and circuit behavior using controlled sources and custom components. We describe our approach to embed full dynamic solutions of alternate non-electrical state variables and indeed abstract quantities within the framework of SPICE. Our approach interplays well with more “fundamental” modeling approaches such as quantum master equations and non-equilibrium Green’s functions, as well as more “system” level modeling approaches such as SystemVerilog, thereby bridging both these worlds for exploration, analysis, simulation, and verification of scaled quantum systems.

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Section: Introductionmentioning

confidence: 89%

Section: Magnetic Topological Textures: Skyrmionsmentioning

confidence: 99%

Circuits and systems modeling of quantum systems in SPICE

Ganguly¹,

Ghosh

Dhar

2023

Quantum Information Science, Sensing, and Computation XV

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“…2 (including the CMOS transistor) for different propagation speed of skyrmions.The VCMA gate EDP will be added to the EDP of a generic skyrmionic device for the proposed design when the VCMA gate is in the ON state. We used our in-house SPICE model[22] to simulate the circuits.…”

mentioning

confidence: 99%

SSRL: Single Skyrmion Reconfigurable Logic Utilizing 2-D Magnus Force on Magnetic Racetracks

Sakib

Vakili

Ganguly

et al. 2022

IEEE J. Explor. Solid-State Comput. Devices Circuits

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Magnetic racetrack memory has frequently been complicated by the pinning of domain wall bits on the one hand and the need to engineer precise synchronization and inter-track repulsion between skyrmionic bits on the other. Such proposals, however, do not capitalize on the complex two-dimensional motion of skyrmions, such as transverse Magnus force that tends to deviate the skyrmion trajectory from rectilinear motion along the current drive. The transverse deviation associated with such a skyrmion Hall effect is normally considered a liability for skyrmions, and efforts have focused on eliminating rather than utilizing it for proposed device applications. We propose a simple single skyrmion-based circuit macro with elementary and higher-order logic gates that utilize Magnus force and propose reconfigurable logic built on these gates. We demonstrate the reliability of the proposed approach with micromagnetics simulation. The energy consumption in this circuit lies mainly in the overhead, with the racetrack consuming a small fraction. The energy-delay-product (EDP) is correspondingly low and can be improved by boosting the skyrmion speed.

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Connecting physics to systems with modular spin-circuits

Selcuk,

Bunaiyan,

Singh

et al. 2024

npj Spintronics

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An emerging paradigm in modern electronics is that of CMOS+ $${\mathsf{X}}$$ X requiring the integration of standard CMOS technology with novel materials and technologies denoted by $${\mathsf{X}}$$ X . In this context, a crucial challenge is to develop accurate circuit models for $${\mathsf{X}}$$ X that are compatible with standard models for CMOS-based circuits and systems. In this perspective, we present physics-based, experimentally benchmarked modular circuit models that can be used to evaluate a class of CMOS+ $${\mathsf{X}}$$ X systems, where $${\mathsf{X}}$$ X denotes magnetic and spintronic materials and phenomena. This class of materials is particularly challenging because they go beyond conventional charge-based phenomena and involve the spin degree of freedom which involves non-trivial quantum effects. Starting from density matrices—the central quantity in quantum transport—using well-defined approximations, it is possible to obtain spin-circuits that generalize ordinary circuit theory to 4-component currents and voltages (1 for charge and 3 for spin). With step-by-step examples that progressively become more complex, we illustrate how the spin-circuit approach can be used to start from the physics of magnetism and spintronics to enable accurate system-level evaluations. We believe the core approach can be extended to include other quantum degrees of freedom like valley and pseudospins starting from corresponding density matrices.

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Compact SPICE Model of Topological Textures on Magnetic Racetracks for Design Space Exploration

Cited by 3 publications

References 14 publications

Circuits and systems modeling of quantum systems in SPICE

Circuits and systems modeling of quantum systems in SPICE

SSRL: Single Skyrmion Reconfigurable Logic Utilizing 2-D Magnus Force on Magnetic Racetracks

Connecting physics to systems with modular spin-circuits

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