From materials to systems: a multiscale analysis of nanomagnetic switching

Abstract

With the increasing demand for low-power electronics, nanomagnetic devices have emerged as strong potential candidates to complement present day transistor technology. A variety of novel switching effects such as spin torque and giant spin Hall offer scalable ways to manipulate nano-sized magnets. However, the low intrinsic energy cost of switching spins is often compromised by the energy consumed in the overhead circuitry in creating the necessary switching fields. Scaling brings in added concerns such as the ability to distinguish states (readability) and to write information without spontaneous backflips (reliability). A viable device must ultimately navigate a complex multi-dimensional material and design space defined by volume, energy budget, speed and a target read-write-retention error. In this paper, we review the major challenges facing nanomagnetic devices and present a multi-scale computational framework to explore possible innovations at different levels (material, device, or circuit), along with a holistic understanding of their overall energy-delay-reliability tradeoff.

Submitted to Journal of Computational Electronics Special Issue "Computational Electronics of Emerging Memory Elements"

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• Multi-scale modelling of current-induced switching in magnetic tunnel junctions using ab initio spin transfer torques
• Machine learning nonequilibrium electron forces for adiabatic spin dynamics
• Analog Signal Processing Using Stochastic Magnets
• Valley-Coupled-Spintronic Non-Volatile Memories with Compute-In-Memory Support
• Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions
• Nonequilibrium dynamics in a spin valve with noncollinear magnetization
• Importance sampling for thermally induced switching and non-switching probabilities in spin-torque magnetic nanodevices
• Spatio-temporal dynamics of voltage-induced resistance transition in the double-exchange model
• Machine-learning modeling of magnetization dynamics in quasi-equilibrium and driven metallic spin systems