Hasan Hayat

Hasan Hayat
SPECIFIC - Swansea University

PhD - Nanoelectronics Engineering

About

18
Publications
3,147
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320
Citations

Publications

Publications (18)
Article
The scaling potential of 'mushroom-type' phase-change memory devices is evaluated, down to single-nanometre dimensions, using physically realistic simulations that combine electro-thermal modelling with a Gillespie Cellular Automata phase-transformation approach. We found that cells with heater contact sizes as small as 6 nm could be successfully a...
Article
Phase-change chalcogenide alloys, such as Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST), have very different optical properties in their amorphous and crystalline phases. The fact that such alloys can be switched, optically or electrically, between such phases rapidly and repeatedly means that they have much potential for applications as tunable...
Article
Phase-change materials have generated very significant interest in recent years due to their potential for data storage and memory applications. For the exploration of phase-change memory many different types of device structures and materials have been presented and investigated by numerous researchers, academic and industrial, using a variety of...
Article
Full-text available
Heart failure resulting from acute myocardial infarction (AMI) is an important global health problem. Treatments of heart failure and AMI have improved significantly over the past two decades; however, the available diagnostic tests only give limited insights into these heterogeneous conditions at a reversible stage and are not precise enough to ev...
Article
Electrochemical biosensing systems coupled with graphene quantum dots (GQDs) have demonstrated suitability for cancer diagnostic strategies, particularly to identify the changes facilitating the early phases of tumorigenesis as well as to detect ultralow concentrations of biomarkers that distinguish between normal and malignant cells. GQDs, known a...
Article
Full-text available
Building energy consumption accounts for 30%–45% of the global energy demand. With an ever-increasing world population, it has now become essential to minimize the energy consumption for the future of the environment. One of the most crucial aspects in this regard is the utilization of sensing and environmental monitoring technologies in buildings...
Article
Integrated phase-change photonic memory devices offer a novel route to non-volatile storage and computing that can be carried out entirely in the optical domain, obviating the necessity for time and energy consuming opto-electrical conversions. Such memory devices generally consist of integrated waveguide structures onto which are fabricated small...
Article
Boron nitride nanoscrolls (BNSs) are open-ended, one-dimensional nanostructures made by the process of rolling boron nitride nanosheets into a scroll-like morphology. BNSs offer a high surface area to volume ratio and possess many unique properties (similar to carbon nanotubes, carbon nanoscrolls, and boron nitride nanotubes) such as high resistanc...
Chapter
In this chapter we address the basic question of the extent to which phase-change memories can be scaled down in size. Fundamental physical limits, along with material properties and device design considerations, all affect the smallest phase-change devices that might be achieved; we explore each of these issues in turn. We also examine the effects...
Article
As an inexpensive monolayer archetypal member of the carbon family, graphene has triggered a new ‘gold rush’ in nanotechnology for achieving unique properties that were not available in many traditional materials. Owing to these unique features, graphene-related materials are finding new uses in nanomedicine and synthetic biology in addition to the...
Article
Neuromorphic, or brain-inspired, computing applications of phase-change devices have to date concentrated primarily on the implementation of phase-change synapses. However, the so-called accumulation mode of operation inherent in phase-change materials and devices can also be used to mimic the integrative properties of a biological neuron. Here we...
Article
The intriguing properties of reduced graphene oxide (rGO) have paved the way for a number of potential biomedical applications such as drug delivery, tissue engineering, gene delivery and bio-sensing. Over the last decade, there have been escalating concerns regarding the possible toxic effects, behaviour and fate of rGO in living systems and envir...
Article
The scaling potential of patterned probe phase-change memory (PP-PCM) cells is investigated, down to single-nanometer dimensions, using physically realistic simulations that combine electrothermal modeling with a Gillespie Cellular Automata (GCA) phase-change model. For this study, a trilayer TiN/Ge <sub xmlns:xlink="http://www.w3.org/1999/xlink">2...
Conference Paper
Phase Change Memory (PCM), based on the reversible transitions of chalcogenides such as Ge 2 Sb 2 Te 5 (GST) between a high resistance amorphous state (binary ‘0’) and low resistance crystalline state (binary ‘1’), is one of the leading contenders to complement or even replace existing technologies such as Flash, DRAM and HDD [1]. This is attribute...