Abstract
Past studies have demonstrated that logic states can be represented using the rotation of the magnetization at flux-closed remanence in individual ferromagnetic disks. In this work, we present the results of micro-magnetic simulations of touching circular elements that can be used for room operable magnetic quantum cellular automata. Like gears in a mechanical system, the chirality of the magnetization alternates from element to element, as determined through interaction with neighbors. The switching of touching symmetric elements occurred when the applied field was removed, meaning minimal energy loss during the process. Maintaining coherence of opposite chirality in chains of elements could be achieved with the introduction of a biasing element to eliminate the bidirectionality of interaction.
Highlights
Interest in viable alternatives to standard transistor-based computing is increasing as scaling nears its limit
Ferromagnetic materials have long been considered as a potential successor, especially in the areas of highdensity storage and magnetic random-access memory (MRAM); their major advantages are non-volatility, higher packing density, and extremely low power dissipation
Their potential use as room temperature magnetic quantum cellular automata (MQCA) has been studied and it has been shown that logic states can be represented using the direction of the in-plane magnetization
Summary
Interest in viable alternatives to standard transistor-based computing is increasing as scaling nears its limit. Ferromagnetic materials have long been considered as a potential successor, especially in the areas of highdensity storage and magnetic random-access memory (MRAM); their major advantages are non-volatility, higher packing density, and extremely low power dissipation By extension, their potential use as room temperature magnetic quantum cellular automata (MQCA) has been studied and it has been shown that logic states can be represented using the direction of the in-plane magnetization.. In the case of symmetric elements such as Permalloy disks, the rotation of the disk’s magnetization in the clockwise or anticlockwise direction can be used to represent logic 1 or 0 The rotation in this “vortex state” happens at flux-closed remanence when the applied field has been removed. An in-field technique such as Lorentz microscopy is not ideal either since repeatable measurements are difficult to obtain due to the shifting electron beam These methods only offer spatial resolution analysis. Simulations are done to bridge the gap by providing an understanding on the formation, motion, and annihilation of the domain walls that enable the switching process itself.
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