Interconnection aspects of spin torque devices: Delay, energy-per-bit, and circuit size modeling

Shaloo Rakheja, Azad Naeemi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Information processing utilizing the spin degree of freedom of the electron may pave the way for the next generation computer. In this paper we have analyzed a nonlocal spin torque device to obtain its performance and energy dissipation as a function of the length of the interconnection between the transmitter and the receiver nanomagnet. Impact of the spin relaxation in the interconnect material on the overall performance and energy dissipation is analyzed. It is shown that spin relaxation lengths of several microns (8 (xm) are highly desirable in order to reduce the energy dissipation substantially and to increase the performance of the circuit. Nanomagnets with dimensions on the order of 15nm 20nm 20nm are critical for logic application since the reduction in the volume of the nanomagnet reduces the amount of electrical injection current needed to rotate the magnetization from parallel to anti-parallel orientation or vice-versa. It is shown that for a Cobalt nanomagnet of volume 6000 nm3 the switching time due to spin-torque can be 12 ns with an energy dissipation of 107 kBT for electrical injection current of 25A and spin relaxation length of 8m. Using stochastic wire length distribution models, the upper bound on the circuit size of the spin-based logic is also obtained for a fixed percentage of gates being dedicated as spin boosters. It is shown that for a spin relaxation length of 8m and Rent's exponent p 2/3, the maximum number of gates in the spin based logic block can be 2000 if the maximum number of spin boosters is limited to 200. Some possible approaches are quantified to reduce the delay of the circuit while maintaining low energy operation.

Original languageEnglish (US)
Title of host publicationProceedings of the 12th International Symposium on Quality Electronic Design, ISQED 2011
Pages736-744
Number of pages9
DOIs
StatePublished - Jun 22 2011
Externally publishedYes
Event12th International Symposium on Quality Electronic Design, ISQED 2011 - Santa Clara, CA, United States
Duration: Mar 14 2011Mar 16 2011

Publication series

NameProceedings of the 12th International Symposium on Quality Electronic Design, ISQED 2011

Other

Other12th International Symposium on Quality Electronic Design, ISQED 2011
CountryUnited States
CitySanta Clara, CA
Period3/14/113/16/11

Keywords

  • non-local spin valve
  • post-CMOS
  • Rent's rule
  • spin torque
  • Spintronics
  • wire length distribution

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Rakheja, S., & Naeemi, A. (2011). Interconnection aspects of spin torque devices: Delay, energy-per-bit, and circuit size modeling. In Proceedings of the 12th International Symposium on Quality Electronic Design, ISQED 2011 (pp. 736-744). [5770811] (Proceedings of the 12th International Symposium on Quality Electronic Design, ISQED 2011). https://doi.org/10.1109/ISQED.2011.5770811