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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"magnetic storage"”.
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Nanoscale interface mechanics with application to magnetic storage
… for cutting-edge applications such as magnetic storage, which arguably constitutes the most successful application of nanotechnology. The goal in magnetic storage is to increase the recording density by reducing the physical spacing between the magnetic layer of the disk and the …
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Microtribodynamics of Sub-Five Nanometers Flying Head -Disk Interfaces in Magnetic Storage
… dynamic models, and their implementation to magnetic storage. Design criteria for sub-5 nm flying HDIs to avoid catastrophic head-disk instabilities due to adhesion were established by performing a 33 full factorial design-of-experiment. The more complicated issue of the presence of both …
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Nanotribology and Nanomechanics Including Nanomechanical Properties, Adhesion and Surface Roughness With Application to Magnetic Storage Hard Disk Drives
In the second part of this work, a systematic approach considering the above basic elements was used to investigate impact-induced contact damage of Head Disk Interfaces during operational shock. A contact mechanics based analysis with consideration of mechanical properties and thickness of various …
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Improved Modeling of Adhesion and Friction in Sub-5 Nm Ultra-Low Flying-Contacting Magnetic Storage Head -Disk Interfaces
In the second part of this study, the flying/contacting dynamics of sub-5 nm HDIs in direct relation to roughness and electrostatic force were investigated using a 2-degree-of-freedom dynamic model, which incorporates the basic elements developed in the first part of this thesis. Then, …
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Dynamic and quasi-static contact and scratch analysis of micro-nanoscale thin solid films with application to magnetic storage hard disk drives
… contact and scratch of the slider and disk in magnetic storage hard disk drives (HDD). Similar contact problems are encountered during the operation of other micromechanical systems like RF-MEMS switches where surface damage is observed after cyclic contact. One of the most critical elements of …
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A measurement of the magnetic field systematic correction to the muon anomalous magnetic moment associated with muon phase space in experiment BNL E821
Using a muon storage ring located at Brookhaven National Laboratory (BNL), the first year of a continuing four year effort to measure the anomalous magnetic moment of the muon to 0.35 ppm has been completed. The measurement hopes to provide a direct experimental determination of the single loop …
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Fundamental Modeling and Experimental Investigation of Dynamic Friction at the Meso and Micro Scales
… as is the case in micro applications, such as magnetic storage applications. The adhesion model is based on the improved DMT contact mechanics model, and the simulation results have shown certain limitations of the proposed adhesion and dynamic friction models. To better improve such modeling …
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Electronic text processing in the large South African life assurance companies
The use of computer technology and magnetic storage media for production typing led to a new term "word processing". In this research word processing is considered to be part only of a more comprehensive concept - electronic text processing. This research project is directed towards the role of …
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Nanomechanical Properties and Nanowear Characterization of Thin Solid Films and Engineering Surfaces
… in various applications, such as semiconductor, magnetic storage and microelectromechanical systems, and their thickness has shrunk from as low as a couple of nanometers to tens of nanometers thick. In this work, nanomechanical properties and nanowear behavior were investigated analytically, …
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Brillouin scattering investigation of nanomagnetic structures
… dynamical properties of arrays of vertical ferromagnetic nanowires and nanorings, which show great promise as high-density magnetic storage and sensor devices. Three closely related projects are reported: (1) observation of bulk magnon quantization in Ni nanowires: bulk spin wave quantization has …
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Magnetic Field Determination for Run 1 of the Fermilab Muon g-2 Experiment
… at Fermilab aims to measure the anomalous magnetic moment of the muon, $a_{\mu}$, to a precision of 140 parts per billion (ppb). The measurement will shed light on the current $>$3$\sigma$ deviation between Standard Model calculations and the previous measurement made at Brookhaven National …
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Novel Quantum Materials for Spintronic and Opto-Electronic Applications
… instance, in spintronics, materials such as ferromagnetic half-metals, Giant Magnetoresistants (GMR), and magnetic semiconductors have been extensively studied due to their ability to manipulate the spin of electrons for applications in magnetic storage. In opto-electronics, materials such as …
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Perpendicular magnetic anisotropy in ion beam sputtered Co/Ni multilayers
Co/Ni multilayers display perpendicular magnetic anisotropy and have applications in magnetic devices that could lead to a large increase in the density of magnetic storage. Co/Ni 10-(2 Å Co/ 8Å Ni) and 10-(2 Å Co/ 4 Å Ni) multilayers were deposited with ion beam sputtering on either ion beam …
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Beam Dynamics Challenges in the Muon g-2 Experiment
The muon's anomalous magnetic moment $a_{\mu}$ has hinted at physics beyond the standard model for nearly 20 years. The Muon $g-2$ experiment at Fermilab aims to measure $a_{\mu}$ to 140 parts per billion (ppb) precision. The 460 ppb result from its first data run (Run-1), released in 2021, agreed …
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Functional 2D nanoparticle/polymer array : interfacial assembly, transfer, characterization, and coupling to photonic crystal cavities
… interest as 2D artificial solids for electronic, magnetic and optical properties and are also of technological interest for a diverse range of applications in micro- and macro-scale devices including photovoltaics, sensors, catalysis, and magnetic storage. By co-assembly with block co-polymers, …
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Towards building a prototype spin-logic device
… Tunneling Magne- toresistance, and advances in magnetic materials have paved the way for exponentially higher bit-densities in magnetic storage. In particular, the discovery of Spin-Transfer Torque (STT) has allowed information to be written to individual magnets using spin-currents. This has …
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Joint Equalization and Decoding via Convex Optimization
… channels (FSCs). Hard-disk drives (or magnetic recording systems), where the required error rate (after decoding) is too low to be verifiable by simulation, are most important applications of this research. Recently, LDPC codes have attracted a lot of attention in the magnetic storage …
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Pattern Formation in Certain Classical and Quantum Systems
<p>My research predominantly focuses on micromagnetic simulations of cobalt nanoparticles. These simulations are carried out by using the Object-Oriented MicroMagnetic Framework: OOMMF) distributed by the National Institute of Standards and Technology: NIST). In performing these simulations, …
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Reversible and Irreversible Effects of Magneto-Ionic Gating: Exchange, Anisotropy, and Magnetization
Access to data, and its storage, is annually becoming of greater concern to consumers, companies, and governments. As the volume and generation of data grow, the technology that writes, reads, and secures it must become faster, more compact, and more efficient. Creating energy-efficient data …
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Optically induced ferro- and antiferromagnetic dynamics in the rare-earth metal dysprosium
… physical limits in speed and size of today's magnetic storage and processing technologies demands new concepts for controlling magnetization and moves researches on optically induced magnetic dynamics. Studies on photoinduced magnetization dynamics and their underlying mechanisms have been …
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