Simulation Studies of Nanomagnet-Based Logic Architecture

Abstract

We report a simulation study on interacting ensembles of Co nanomagnets that can perform basic logic operations and propagate logic signals where the state variable is the magnetization direction. Dipole field coupling between individual nanomagnets drives the logic functionality of the ensemble, and coordinated arrangements of the nanomagnets allow for the logic signal to propagate in a predictable way. Problems with the integrity of the logic signal arising from instabilities in the constituent magnetizations are solved by introducing a biaxial anisotropy term to the Gibbs magnetic free energy of each nanomagnet. The enhanced stability allows for more complex components of a logic architecture capable of random combinatorial logic, including horizontal wires, vertical wires, junctions, fanout nodes, and a novel universal logic gate. Our simulations define the focus of scaling trends in nanomagnet-based logic and provide estimates of the energy dissipation and time per nanomagnet reversal.

Engineering spin-wave channels in submicrometer magnonic waveguides

“…magnetic wires bearing spin waves [3][4][5][6][7] or domain walls, [8][9][10] or nanomagnet networks. [11][12][13][14][15][16] The devices using spin waves represent a prospective direction taking into account their intrinsic low-power character, two usable features for processing, i.e. the amplitude and phase 3 (the latter is frequency-and wavenumber-dependent) of spin waves, and many available intrinsic attributes specific to waves [17][18][19][20] such as interference.…”

Magnetic State of Multilayered Synthetic Antiferromagnets during Soliton Nucleation and Propagation for Vertical Data Transfer

“…[ 3 ] The nonvolatility of this technology, [ 1 ] its potential ultra-low power consumption, [ 4 ] the possibility to address data using spin-transfer-torque [ 5 ] or the spin-Hall effect, [ 6 ] the robustness of some designs against data transfer errors caused by thermal fl uctuations, [ 7 ] and the high speeds of data transfer [ 8 ] have identifi ed NML as a promising candidate for future computing technologies. One of the main unresolved challenges for NMLbased technology is data transfer in the vertical direction, a necessary step toward 3D spintronic systems.…”

Investigating the effect of a stress-based uniaxial anisotropy on the magnetic behaviour of La0.7Sr0.3MnO3elements

“…It has previously been shown that when grown on STO(110) substrates, a stress-based uniaxial anisotropy is induced in LSMO films whilst a biaxial anisotropy is observed for LSMO grown on (001)-oriented STO substrates. It has been shown that the addition of a biaxial anisotropy to interacting Co nanoislands enhances their hard axis stability [6] and consequently may be exploited in magnetic logic circuits. Here, we focus on the magnetic behaviour of LSMO films on (110)-oriented STO substrates and use micromagnetic simulations to show that by combining the shape anisotropy with a uniaxial anisotropy, it is possible to tailor the magnetic domain structure and ultimately the domain wall width.…”