Energy Efficient All-Electric-Field-Controlled Multiferroic Magnetic Domain-Wall Logic

Abstract

Magnetic domain wall (DW)-based logic devices offer numerousopportunitiesfor emerging electronics applications allowing superior performancecharacteristics such as fast motion, high density, and nonvolatilityto process information. However, these devices rely on an externalmagnetic field, which limits their implementation; this is particularlyproblematic in large-scale applications. Multiferroic systems consistingof a piezoelectric substrate coupled with ferromagnets provide a potentialsolution that provides the possibility of controlling magnetizationthrough an electric field via magnetoelastic coupling. Strain-inducedmagnetization anisotropy tilting can influence the DW motion in acontrollable way. We demonstrate a method to perform all-electricallogic operations using such a system. Ferromagnetic coupling betweenneighboring magnetic domains induced by the electric-field-controlledstrain has been exploited to promote noncollinear spin alignment,which is used for realizing essential building blocks, including DWgeneration, propagation, and pinning, in all implementations of Booleanlogic, which will pave the way for scalable memory-in-logic applications.