Design and Optimization of Skyrmion-Based Racetrack Memory by Overcoming Clogging and Annihilation of Skyrmion Signals

SPIN ◽  
2019 ◽  
Vol 09 (03) ◽  
pp. 1950019
Author(s):  
Li Zhao ◽  
Lei Qiu ◽  
Guoping Zhao ◽  
Ping Lai ◽  
Nian Ran ◽  
...  
Keyword(s):  
Data Storage ◽  
High Speed ◽  
Domain Walls ◽  
Electron Flow ◽  
Building Blocks ◽  
Magnus Force ◽  
Design And Optimization ◽  
Convex Part ◽  
Magnetic Skyrmions ◽  
The Right

Magnetic skyrmions are promising building blocks for next generation data storage due to their stability, small size and extremely low currents to drive them. Skyrmion-based metallic racetrack memory has potential to replace traditional domain walls to store information as data bits, in which, however, skyrmions can drift from the direction of electron flow due to the Magnus force. In addition, skyrmion-edge effect at the end of the racetrack can cause the clogging of the skyrmions at the end of the racetrack. Here, we show that the clogging of skyrmion signals can be avoided by adding various kinds of notch at the end of the racetracks. On the other hand, by adding high-[Formula: see text] materials (materials with high magnetic crystalline anisotropy) at the edges, the skyrmions can be confined in the center region of the metallic racetrack successfully. This design can overcome the problems of both clogging and annihilation according to our micromagnetic simulation. As a result, skyrmions can pass the right end of the racetrack efficiently at a very high speed (100–300[Formula: see text]m/s), whereas the driving current is much smaller in comparison with other racetrack design. Besides, we study the influence of the uneven part at the joint of the high-[Formula: see text] material and the CoPt racetrack on the skyrmionic motion. It is found that at the joint between the high-[Formula: see text] material and the CoPt racetrack, the concave part basically does not affect the passage of skyrmion, but the convex part does when the length and width of the convex part reach a certain value. The results show that the design has high feasibility.

Domain Walls

2020 ◽  
Author(s):  
Dennis Meier ◽  
Jan Seidel ◽  
Marty Gregg ◽  
Ramamoorthy Ramesh
Keyword(s):  
Data Storage ◽  
High Speed ◽  
Domain Walls ◽  
Active Role ◽  
Data Streaming ◽  
Oxide Interface ◽  
Nano Technology ◽  
New Type ◽  
Available Information ◽  
New Generation

Technological evolution and revolution are both driven by the discovery of new functionalities, new materials and the design of yet smaller, faster, and more energy-efficient components. Progress is being made at a breathtaking pace, stimulated by the rapidly growing demand for more powerful and readily available information technology. High-speed internet and data-streaming, home automation, tablets and smartphones are now ‘necessities’ for our everyday lives. Consumer expectations for progressively more data storage and exchange appear to be insatiable. In this context, ferroic domain walls have attracted recent attention as a completely new type of oxide interface. In addition to their functional properties, such walls are spatially mobile and can be created, moved, and erased on demand. This unique degree of flexibility enables domain walls to take an active role in future devices and hold a great potential as multifunctional 2D systems for nanoelectronics. With domain walls as reconfigurable electronic 2D components, a new generation of adaptive nano-technology and flexible circuitry becomes possible, that can be altered and upgraded throughout the lifetime of the device. Thus, what started out as fundamental research, at the limit of accessibility, is finally maturing into a promising concept for next-generation technology.

scholarly journals DESIGN, IMPLEMENTATION AND ANALYSIS OF FLASH ADC ARCHITECTURE WITH DIFFERENTIAL AMPLIFIER AS COMPARATOR USING CUSTOM DESIGN APPROACH

2012 ◽  
pp. 51-56
Author(s):  
CHANNAKKA LAKKANNAVAR ◽  
SHRIKANTH K. SHIRAKOL ◽  
KALMESHWAR N. HOSUR
Keyword(s):  
Data Storage ◽  
High Speed ◽  
Digital Signal ◽  
Building Blocks ◽  
Input Voltage ◽  
Cmos Technology ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Flash Adc ◽  
Analog To Digital

Analog-to-Digital Converters (ADCs) are useful building blocks in many applications such as a data storage read channel and an optical receiver because they represent the interface between the real world analog signal and the digital signal processors. Many implementations have been reported in the literature in order to obtain high-speed analog-todigital converters (ADCs). In this paper an effort is made to design 4-bit Flash Analog to Digital Converter [ADC] using 180nm cmos technology. For high-speed applications, a flash ADC is often used. Resolution, speed, and power consumption are the three key parameters for an Analog-to-Digital Converter (ADC). The integrated flash ADC is operated at 4-bit precision with analog input voltage of 0 to 1.8V. The ADC has been designed, implemented & analysed in standard gpdk180nm technology library using Cadence tool.

Motion of Skyrmions in Well-Separated Two-Lane Racetracks

SPIN ◽  
2017 ◽  
Vol 07 (01) ◽  
pp. 1740006 ◽  
Author(s):  
P. Lai ◽  
G. P. Zhao ◽  
F. J. Morvan ◽  
S. Q. Wu ◽  
N. Ran
Keyword(s):  
Data Storage ◽  
Energy Efficient ◽  
Binary Data ◽  
Domain Walls ◽  
Magnetocrystalline Anisotropy ◽  
Magnetic Domain ◽  
Lane Width ◽  
Magnetic Domain Walls ◽  
Magnetic Skyrmions ◽  
Transport Device

Magnetic skyrmions are topological structures which can be used to store information as data bits in metallic racetrack memories. Their good properties, such as their stability, small size and low currents needed to drive them make them better candidates than traditional magnetic domain walls for the building of the next generation data storage. A skyrmion racetrack memory has been suggested, with the binary data encoded in the distance between skyrmions when the racetrack is a single lane. Here, we propose a new skyrmion-based two-lane racetrack structure separated by a high-[Formula: see text] (high magnetocrystalline anisotropy) middle lane, which confines the skyrmions in their respective lanes. This design gives a new data presentation for the skyrmions on the racetrack. Phase diagrams for the skyrmion motion on the proposed racetrack as functions of the current density, middle lane anisotropy, middle lane width and DMI constant have been calculated and given, demonstrating that skyrmions can be driven in different lanes of the racetrack. This design offers the possibility of building an ultrafast and energy-efficient skyrmion transport device.

Influence of social media marketing towards purchase of residential property

2019 ◽  
Vol 118 (6) ◽  
pp. 145-149
Author(s):  
A. Ekanthalingam ◽  
Dr. A. Gopinath
Keyword(s):  
Social Media ◽  
High Speed ◽  
Word Of Mouth ◽  
Marketing Strategies ◽  
Social Media Marketing ◽  
Purchase Decision ◽  
Residential Property ◽  
Customer Delight ◽  
The Right ◽  
Potential Customers

‘Marketing’ is not just an activity. It is a process, a philosophy and a phenomenon. The evolution of marketing has produced tremendous benefits to business and end consumers. The innovation in this field has been steady and yet at high speed. From ‘word of mouth advertising’ which was the only option earlier we are now at the mercy of what consumers are sharing about their experience on the internet. Social Media has become more powerful than what we think and this article shows how we can leverage this to benefit the top-line and customer delight. We dive deep to understand the influence Social Media can create towards purchase of residential property. As much complex it is to make the purchase decision of a property, it is equally difficult for marketers to send the right message to their target audience. Through this article, we are trying to see how marketers have transformed their traditional marketing strategies to address the needs of the millennial population, who are the most potential customers for property purchase.

An all optical photonic crystal half adder suitable for optical processing applications

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hamed Azhdari ◽  
Sahel Javahernia
Keyword(s):  
Photonic Crystal ◽  
Optical Waveguides ◽  
High Speed ◽  
Building Blocks ◽  
Optical Signal ◽  
Ring Resonators ◽  
Optical Processing ◽  
Nonlinear Photonic Crystal ◽  
Half Adder ◽  
All Optical

Abstract Increasing the speed of operation in all optical signal processing is very important. For reaching this goal one needs high speed optical devices. Optical half adders are one of the important building blocks required in optical processing. In this paper an optical half adder was proposed by combining nonlinear photonic crystal ring resonators with optical waveguides. Finite difference time domain method wase used for simulating the final structure. The simulation results confirmed that the rise time for the proposed structure is about 1 ps.

scholarly journals 2D-3D integration of hexagonal boron nitride and a high-κ dielectric for ultrafast graphene-based electro-absorption modulators

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hitesh Agarwal ◽  
Bernat Terrés ◽  
Lorenzo Orsini ◽  
Alberto Montanaro ◽  
Vito Sorianello ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hafnium Oxide ◽  
High Speed ◽  
Hexagonal Boron Nitride ◽  
Temperature Stability ◽  
Cost Effective ◽  
Fold Increase ◽  
Building Blocks ◽  
High Quality ◽  
New Device

AbstractElectro-absorption (EA) waveguide-coupled modulators are essential building blocks for on-chip optical communications. Compared to state-of-the-art silicon (Si) devices, graphene-based EA modulators promise smaller footprints, larger temperature stability, cost-effective integration and high speeds. However, combining high speed and large modulation efficiencies in a single graphene-based device has remained elusive so far. In this work, we overcome this fundamental trade-off by demonstrating the 2D-3D dielectric integration in a high-quality encapsulated graphene device. We integrated hafnium oxide (HfO2) and two-dimensional hexagonal boron nitride (hBN) within the insulating section of a double-layer (DL) graphene EA modulator. This combination of materials allows for a high-quality modulator device with high performances: a ~39 GHz bandwidth (BW) with a three-fold increase in modulation efficiency compared to previously reported high-speed modulators. This 2D-3D dielectric integration paves the way to a plethora of electronic and opto-electronic devices with enhanced performance and stability, while expanding the freedom for new device designs.

scholarly journals Neuro-Inspired Signal Processing in Ferromagnetic Nanofibers

Biomimetics ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 32
Author(s):  
Tomasz Blachowicz ◽  
Jacek Grzybowski ◽  
Pawel Steblinski ◽  
Andrea Ehrmann
Keyword(s):  
Data Processing ◽  
Data Storage ◽  
Domain Walls ◽  
Data Transfer ◽  
Synaptic Activity ◽  
Neuromorphic Computing ◽  
Rotating Magnetic Fields ◽  
Micromagnetic Simulations ◽  
Energy Consuming ◽  
Stochastic Data

Computers nowadays have different components for data storage and data processing, making data transfer between these units a bottleneck for computing speed. Therefore, so-called cognitive (or neuromorphic) computing approaches try combining both these tasks, as is done in the human brain, to make computing faster and less energy-consuming. One possible method to prepare new hardware solutions for neuromorphic computing is given by nanofiber networks as they can be prepared by diverse methods, from lithography to electrospinning. Here, we show results of micromagnetic simulations of three coupled semicircle fibers in which domain walls are excited by rotating magnetic fields (inputs), leading to different output signals that can be used for stochastic data processing, mimicking biological synaptic activity and thus being suitable as artificial synapses in artificial neural networks.

scholarly journals Giant conductivity of mobile non-oxide domain walls

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
S. Ghara ◽  
K. Geirhos ◽  
L. Kuerten ◽  
P. Lunkenheimer ◽  
V. Tsurkan ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Domain Wall ◽  
Domain Walls ◽  
Building Blocks ◽  
External Fields ◽  
Tail Domain ◽  
Oxide Electronics ◽  
Domain Wall Mobility ◽  
Conductance Changes ◽  
Wall Mobility

AbstractAtomically sharp domain walls in ferroelectrics are considered as an ideal platform to realize easy-to-reconfigure nanoelectronic building blocks, created, manipulated and erased by external fields. However, conductive domain walls have been exclusively observed in oxides, where domain wall mobility and conductivity is largely influenced by stoichiometry and defects. Here, we report on giant conductivity of domain walls in the non-oxide ferroelectric GaV4S8. We observe conductive domain walls forming in zig-zagging structures, that are composed of head-to-head and tail-to-tail domain wall segments alternating on the nanoscale. Remarkably, both types of segments possess high conductivity, unimaginable in oxide ferroelectrics. These effectively 2D domain walls, dominating the 3D conductance, can be mobilized by magnetic fields, triggering abrupt conductance changes as large as eight orders of magnitude. These unique properties demonstrate that non-oxide ferroelectrics can be the source of novel phenomena beyond the realm of oxide electronics.

scholarly journals WindFlow: High-Speed Continuous Stream Processing with Parallel Building Blocks

2021 ◽  
pp. 1-1
Author(s):  
Gabriele Mencagli ◽  
Massimo Torquati ◽  
Andrea Cardaci ◽  
Alessandra Fais ◽  
Luca Rinaldi ◽  
...  
Keyword(s):  
High Speed ◽  
Stream Processing ◽  
Building Blocks ◽  
Continuous Stream

Hard Nano-Crystalline Coatings for Cutting Tools

2007 ◽  
Vol 567-568 ◽  
pp. 185-188 ◽  
Author(s):  
Miroslav Piska
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Dry Cutting ◽  
Nano Crystalline ◽  
The Right ◽  
Machining Productivity ◽  
Hard Cutting ◽  
Cutting Tool Materials

Modern trends in metal cutting, high speed/feed machining, dry cutting and hard cutting set more demanding characteristics for cutting tool materials. The exposed parts of the cutting edges must be protected against the severe loading conditions and wear. The most significant coatings methods for cutting tools are PVD and CVD/MTCVD today. The choice of the right substrate or the right protective coating in the specific machining operation can have serious impact on machining productivity and economy. In many cases the deposition of the cutting tool with a hard coating increases considerably its cutting performance and tool life. The coating protects the tool against abrasion, adhesion, diffusion, formation of comb cracks and other wear phenomena.

Sign in / Sign up

Export Citation Format

Share Document