Design and Analysis of Si Interconnects for All-Spin Logic

Chang, Sou-Chi; Manipatruni, Sasikanth; Nikonov, Dmitri E.; Young, Ian A.; Naeemi, Azad

doi:10.1109/tmag.2014.2325536

Cited by 32 publications

(22 citation statements)

References 60 publications

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“…This makes silicon attractive for use as efficient spin interconnects [130] in lateral spin valves and logic gates [42,43] known as all-spin logic [44]. Spin interconnects are critical for emerging spin-driven devices as they allow avoiding the spin-charge signal conversion thus reducing energy, delay, and circuitry.…”

Section: Tunnel Barriers and Magnetoresistance At Elevated Temperaturementioning

confidence: 99%

Silicon spintronics: Progress and challenges

Sverdlov

Selberherr

2015

Physics Reports

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Section: Tunnel Barriers and Magnetoresistance At Elevated Temperaturementioning

confidence: 99%

Silicon spintronics: Progress and challenges

Sverdlov

Selberherr

2015

Physics Reports

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“…This large deviation can impair the reliability of the interconnect significantly since the DW can reach the end of the wire with quite different delays. The similar constraint can be also be observed in interconnects based on spin-transfer torque switching [8] [9], where the delay distribution becomes wider as the interconnect length increases or the applied voltage is reduced. As a result, to reduce the noise effect on DW automotion, an interconnect with low Gilbert damping is recommended since the magnitude of the thermal field can be reduced, and the deviation from the noiseless situation is largely suppressed using a low damping channel as shown in Fig.…”

Section: Thermal Fluctuationsmentioning

confidence: 57%

“…For ASL, interconnects have been studied using a lateral conventional spin valve with the spin-transfer-torque switching using copper, aluminum, and silicon as channel materials [8] [9]. It is shown that the energy of the interconnect is significantly reduced by eliminating the shunt path in ASL.…”

Section: Introductionmentioning

confidence: 99%

“…The concept of spintronic interconnects using automotion of DWs has been proposed in [19], and in general, the DW velocity in a wire is less than that in a plane due to less degrees of freedom for DW shape transformations. However, in terms of energy, it has an obvious advantage over the existing proposed interconnects [8] [9], where the charge current flowing through the channel is always required to carry spin information. Therefore, this paper aims at clarifying the potential of DW automotion as interconnects for ASL.…”

Section: Introductionmentioning

confidence: 99%

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Interconnects for All-Spin Logic Using Automotion of Domain Walls

CHANG

Dutta

Manipatruni

et al. 2015

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

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In this paper, an interconnect scheme based on automotion of domain walls for all-spin logic has been proposed. The proposed interconnect is analyzed using a comprehensive numerical model including an equivalent circuit for all-spin logic operations [1], the one-dimensional Landau-Lifshitz-Gilbert equation for domain wall creation, reflection, and disappearance at the boundaries. Analytical expressions for domain wall transport [2][3][4] along the wire are also presented. From the model, it is found that the reflection of the domain wall can be eliminated by using a material with high Gilbert damping coefficient at the end, the energy dissipation can be independent of the interconnect length, and domain wall displacement and energy dissipation can be further improved using a material with a low damping factor and saturation magnetization. Furthermore, the interconnect reliability is also studied by applying the thermal random noise analysis on the dynamics of domain walls, and it is found that thermal fluctuations can have a significant impact on the interconnect performance; thus, the interconnect with a low Gilbert damping factor is desired to suppress the thermal noise effects.

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“…The spin transport characteristics of spin circuit for NLSV are captured based on the lumped spin circuit model used in [4], [15] and [24]. A lumped circuit representation is derived for each region (FM, graphene and tunnel region) of the spin circuit structure, by solving the spin diffusion equations for spin and charge transport separately.…”

Section: Tcl Modelmentioning

confidence: 99%

All Spin Logic: A Micromagnetic Perspective

2015

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Most investigations of all spin logic (ASL) havebeen based on the mono -domain approximation of magnetization switching. The sensitive and stochastic nature of spin transfer torque (STT) switching creates pressing requirements for analyzing all spin logic from a micromagnetic perspective also. Hence, in this paper, all spin logic is studied from a micromagnetic perspective by developing a simulation framework that can capture diffusive spin transport. The spin transport model is calibrated from existing experimental results on non-local spin valve measurements. Then, using this framework, spin transfer torque switching is studied for inputoutput nano-magnets with in-plane and perpendicular magnetic anisotropy for all spin logic devices (ASLD). Precisely defined architecture and design constraints for such input-output nanomagnets are presented. Further, a previously proposed switching mechanism by driving the nano-magnet into a metastable state is also incorporated into micromagnetic framework. By using the aforementioned mechanism, the critical current required for spin transfer torque switching can be reduced to as low as 20μA. Moreover, graphene channel all spin logic device using tunnel contact at the injector is demonstrated for copy and invert logic operations.Index Terms-All spin logic (ASL), micromagnetic simulation, perpendicular magnetic anisotropy (PMA), spin transfer torque (STT), spin transport. area of high speed interconnects, low power VLSI design, nanoscale devices, carbon nanotube based designs, organic thin film transistor design and modelling, and spintronics based devices and circuits.

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Design and Analysis of Si Interconnects for All-Spin Logic

Cited by 32 publications

References 60 publications

Silicon spintronics: Progress and challenges

Silicon spintronics: Progress and challenges

Interconnects for All-Spin Logic Using Automotion of Domain Walls

All Spin Logic: A Micromagnetic Perspective

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