Geometry Effects in Switching of Nanomagnets with Strain: Reliability, Energy Dissipation and Clock Speed in Dipole-Coupled Nanomagnetic Logic

Abstract

Strain-clocked dipole-coupled nanomagnetic logic is an energy-efficient Boolean logic paradigm whose progress has been stymied by its propensity for high error rates. In an effort to mitigate this problem, we have studied the effect of nanomagnet geometry on error rates, focusing on elliptical and cylindrical geometries. We had previously reported that the out-of-plane excursion of the magnetization vector during switching creates a precessional torque that is responsible for high switching error probability in elliptical nanomagnet geometries. The absence of this torque in cylindrical magnets portends lower error rates, but our simulations show that the error rate actually does not improve significantly compared to elliptical magnets while the switching becomes unacceptably slow. Here, we show that dipole coupled nanomagnetic logic can offer relatively high reliability (switching error probability < 10^-8), moderate clock speed (~ 100 MHz) and 2-3 orders of magnitude energy saving compared to CMOS devices, provided the shape anisotropy energy barrier of the magnet is increased to at least ~5.5 eV to allow engineering a stronger dipole coupling between neighboring nanomagnets.

8 pages

References in corpus (4)

• Spin Transfer Torques
• Experimental Clocking of Nanomagnets with Strain for Ultra Low Power Boolean Logic
• Directed Self-Assembly of Epitaxial CoFe2O4-BiFeO3 Multiferroic Nanocomposites
• Reducing error rates in straintronic multiferroic dipole-coupled nanomagnetic logic by pulse shaping

Cited by in corpus (9)

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• Energy-efficient switching of nanomagnets for computing: Straintronics and other methodologies
• Dynamic Error in Strain Induced Magnetization Reversal of Nanomagnets due to Incoherent Switching and Formation of Metastable States: A Size-dependent Study
• Experimental demonstration of acoustic wave induced magnetization switching of dipole coupled magnetostrictive nanomagnets for ultralow power computing
• An observable effect of spin inertia in slow magneto-dynamics: Increase of the switching error rates in nanoscale ferromagnets
• Nanomagnetic Boolean Logic -- The Tempered (and Realistic) Vision
• Polarized Neutron Reflectometry Study of Depth Dependent Magnetization Variation in Co Thin Film on a PMN-PT Substrate
• Straintronic magneto-tunneling-junction based ternary content addressable memory