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On-Chip Clocking of Nanomagnet Logic Lines and Gates

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7 Author(s)
Alam, M.T. ; Dept. of Electr. Eng., Univ. of Notre Dame, Notre Dame, IN, USA ; Kurtz, S.J. ; Siddiq, M.A.J. ; Niemier, M.T.
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The nanomagnet logic (NML) devices considered here are variants of proposed components for the edge-driven, quantum-dot cellular automata device architecture, where the position of electrons on quantum dots was suggested as a mechanism for representing binary state. To control NML circuit components (e.g., gates and lines), to date, externally generated magnetic fields have served as a clock. The clock is used to make the magnets in a circuit ensemble transition to a metastable state, so fringing fields from individual devices can set the state of a neighboring device in accordance with a new input. However, such a clocking scheme is obviously not extensible to chip-level systems. For NML to be a viable candidate for digital systems, a mechanism for simultaneously modulating the energy barriers of a group of devices must be implemented “on-chip,” and guarantee unidirectional dataflow from circuit input to circuit output. We have experimentally demonstrated a CMOS-compatible clock, and used it to reevaluate all of the NML constructs required for a functionally complete logic set. All possible input combinations to said constructs were successfully considered. Experiments were designed to promote unidirectional dataflow.

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Nanotechnology, IEEE Transactions on  (Volume:11 ,  Issue: 2 )