Analysis of the Magnetostatic Energy of Chains of Single-Domain Nanomagnets for Logic Gates

作者：Melo Luiz G C^*; Soares Thiago R B S; Neto Omar P Vilela

来源：IEEE Transactions on Magnetics, 2017, 53(9): 3400510.

DOI：10.1109/TMAG.2017.2704913

• Magnetic field-coupling computing
• magnetostatic energy
• nanomagnet logic (NML)
• single-domain nanomagnets

Nanomagnet logic (NML) circuits are magnetic field-coupled interacting structures built up from nanoscaled magnets to perform logic operations. The bistable character of nanomagnets' magnetization is associated with "0" and "1" logic states, which may be used to perform Boolean operations. In this paper, we first investigate the limits of single-domain magnetic structure in modeling the magnetostatic energy of particles of several polyhedron shapes. The model, which is based on the evaluation of multidimensional integrals through the Monte Carlo method, includes the demagnetizing energy of individual magnetic specimens and the dipolar coupling between two or more nanomagnets. The accuracy and the limits of the model are evaluated through comparison with a well-established numerical micromagnetic solver. The magnetostatic behavior for several configurations of horizontal chain of interacting nanomagnets (NML wire) is investigated. Rectangular nanomagnets present weak dipolar antiferromagnetic (AF) coupling that may result in error during information propagation across the chain. We examine a novel wire structure formed by a sequence of different slanted nanomagnets that yield strong dipolar coupling. For this system, error during information propagation is very unlikely, since the magnetic energy of the particles has single global minima corresponding to stable AF alignment. The proposed model can be readily applied as a tool for the study of advanced NML circuits and systems.

• 出版日期2017-9