Characteristics of signal propagation in magnetic quantum cellular automata circuits

Yang, Xiaokuo; Cai, Li; Huang, Hongtu; Bai, Peng; Peng, Weidong

doi:10.1049/mnl.2011.0077

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The latch design utilises the previous pipeline clocking mechanism of the nanomagnet logic device developed by our group. In general, each magnetic logic clocking has three clock phases, they are RELAX, CLOCKED and SWITCH [9]. When an assemble of nanomagnets is in the RELAX phase, for example, the wire shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Low‐power digital latch circuit using magnetic logic device

et al. 2015

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The in-plane magnetic logic device is a spin-based technology which offers several advantages over charged-based devices such as nonvolatility, ultra-low power and greater integration density. A novel low-power digital latch circuit is proposed by using various shaped nanomagnets. Specifically, a pipelined clocking layout is effectively constructed to ensure sequential and reliable operation. The simulation results show that the magnetic logic latch performs well. The proposed circuit is promising in building future ultra-low power magnetic memories, and may inspire new applications (i.e. magnetic arithmetic circuits).

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Section: Introductionmentioning

confidence: 99%

Low‐power digital latch circuit using magnetic logic device

et al. 2015

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“…As an advantage compared to the above mentioned electrostatic devices, logic gates featuring single-domain magnets in the size scale of 100 nm are expected to operate at room temperature, because of the relatively high coupling energy [6]. However, expensive equipment and an excellent control on the geometries and materials are required to operate on those scales [7,8]. Recently, authors in [9] experimentally demonstrated using Electron Beam Lithography (EBL) that a logic signal can be propagated not only through a wire, like in [10], but through a fanout circuit.…”

Section: Introductionmentioning

confidence: 99%

Magnetic dipolar coupling and collective effects for binary information codification in cost-effective logic devices

Chiolerio

Allia

Graziano

2012

Journal of Magnetism and Magnetic Materials

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a b s t r a c tPhysical limitations foreshadow the eventual end to traditional Complementary Metal Oxide Semiconductor (CMOS) scaling. Therefore, interest has turned to various materials and technologies aimed to succeed to traditional CMOS. Magnetic Quantum dot Cellular Automata (MQCA) are one of these technologies. Working MQCA arrays require very complex techniques and an excellent control on the geometry of the nanomagnets and on the quality of the magnetic thin film, thus limiting the possibility for MQCA of representing a definite solution to cost-effective, high density and low power consumption device demand. Counter-intuitively, moving towards bigger sizes and lighter technologies it is still possible to develop multi-state logic devices, as we demonstrated, whose main advantage is costeffectiveness. Applications may be seen in low cost logic devices where integration and computational power are not the main issue, eventually using flexible substrates and taking advantage of the intrinsic mechanical toughness of systems where long range interactions do not need wirings. We realized cobalt micrometric MQCA arrays by means of Electron Beam Lithography, exploiting cost-effective processes such as lift-off and RF sputtering that usually are avoided due to their low control on array geometry and film roughness. Information relative to the magnetic configuration of MQCA elements including their eventual magnetic interactions was obtained from Magnetic Force Microscope (MFM) images, enhanced by means of a numerical procedure and presented in differential maps. We report the existence of bi-stable magnetic patterns, as detected by MFM while sampling the z-component of magnetic induction field, arising from dipolar inter-element magnetostatic coupling, able to store and propagate binary information. This is achieved despite the array quality and element magnetic state, which are low and multi-domain, respectively. We discuss in detail shape, inter-element spacing and dot profile effects on the magnetic coupling. Numerical Finite Element Method (FEM) simulations show a possible microspin arrangement producing such magnetostatic coupling.

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