Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 59 for “"Magnetic Recording"”.
-
Particulate dispersions for magnetic recording data
The study of a magnetic recording media dispersion has been carried out using hindered settling analysis, the purpose of which was to probe the equilibrium state structure in zero applied magnetic field. The system chosen for the main study was based on a commercial formulation of a y-Fe 203 …
-
The tribology of laminated magnetic recording heads
… lead to pole tip recession (PTR) in laminated magnetic recording heads (also known as "sandwich heads"). These heads provide a platform for the utilisation of advanced soft magnetic thin films in practical recording heads suitable for high frequency helical scan tape recording systems. PTR …
-
An investigation of thin film magnetic recording media
… surface of commercial thin film metal evaporated magnetic recording media have been correlated to recording error and signal degradation measurements. Modified and adapted commercial Hi-8 video recorders have been used for sample generation whilst analytical techniques such as SXPS,IMS and SEM …
-
Channel matched iterative decoding for magnetic recording systems.
The perpendicular magnetic recording channel (PMRC) is corrupted by sever intersymbol interference and data-dependent media noise, in addition to a variety of other bursty impairments. Thus far, the hard decodable symbol correcting Reed-Solomon (RS) code has been the industry standard for outer …
-
Remanent state noise in particulate magnetic recording media
… is the variation in stray flux emanating from a magnetic recording medium which is in a remanent state of magnetisation. A portion of this noise is related to the magnetic microstructure of the recording medium. This study had two main objectives. The first was to devise and implement hard and …
-
Information Theoretic Limits for Secure Multimedia and Magnetic Recording
The second part of this thesis addresses the problem of finding the capacity of two-dimensional (1, infinity) constrained channels for a binary alphabet. The Shannon capacity of a constrained channel is generalized to a notion of soft capacity which allows violations of the constraint. By drawing …
-
ELECTROCHEMICAL SYNTHESIS OF MAGNETIC MATERIALS FOR MAGNETIC RECORDING AND MEMS APPLICATIONS
With the increase in the areal density for magnetic recording disks, the bits are becoming smaller so that more bits can be accommodated in a given area of disk. However, there is a certain limit up to which the bits can be made smaller until it reaches the superparamagnetic limit, where bits …
-
Micromagnetic Study of Composite Media for High Density Heat Assisted Magnetic Recording
… the areal density of current perpendicular magnetic recording technology tends to saturate at 1 Tb per square inch. Therefore, new technologies like Heat Assisted Magnetic Recording (HAMR) are needed. On the other hand, the Solid State Drive (SSD) has developed quickly as another candidate …
-
High Anisotropy CoPt (L1(0) & L1(1) Phase) Magnetic Recording Media Films
For magnetic recording technology, much effort is currently devoted to the achievement of areal density up to 1 Tb per square inch and beyond. The enhancement of the magnetic recording areal density is governed by the characteristics of magnetic recording media. Media material with large …
-
Study of Modulation and Error Control Coding in Thick Film Digital Magnetic Recording
… and Error Correction codes to Digitally Recorded Magnetic Data.<br/><br/>The effects of these coding schemes were measured against bitshift errors which are induced by different Non Clockloss Error Mechanisms. These Error mechanisms are Noise and Inter Symbol Interference, ISI. The Thesis has an …
-
The role of heat assisted magnetic recording in future hard disk drive applications
… very well be a disruptive technology in the magnetic recording industry. Companies that intend to profit from this technology need to invest on its development and must try to be first-to-volume production to benefit from economies of scale and to build the necessary expertise that could give …
-
Advances in Modeling and Signal Processing for Bit-Patterned Magnetic Recording Channels with Written-In Errors
In the past perpendicular magnetic recording on continuous media has served as the storage mechanism for the hard-disk drive (HDD) industry, allowing for growth in areal densities approaching 0.5 Tb/in2. Under the current system design, further increases are limited by the superparamagnetic effect …
-
Fabrication and application of patterned magnetic media
… to overcome the superparamagnetism in thin film magnetic recording media, a novel magnetic medium, called patterned medium, is studied here as a potential candidate for the future hard disk storage application. Within the patterned medium, one bit is stored in one magnetic unit, which has to be …
-
Disturbance attenuation with multi-sensing servo systems for high density storage devices
Track densities in magnetic recording demonstrations for future HDDs (Hard-Disk Drives) are projected to exceed 500,000 TPI (Tracks-Per-Inch) in the year 2007 and are still increasing. However due to the renowned superparamagnetic limitation in magnetic recording physics, data storage industries …
-
Magnetism and interactions within the single domain limit: reversal, logic and information storage
Magnetism and magnetic material research on mesoscopic length scale, especially on the size-dependent scaling laws have drawn much attention. From a scientific point of view, magnetic phenomena would vary dramatically as a function of length, corresponding to the multi-single magnetic domain …
-
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 …
-
NONLINEAR SPIN DYNAMICS AND ULTRA-FAST PRECESSIONAL SWITCHING
… technological applications in the area of magnetic data storage, as well as by pure scientific quest for ultra-fast spin dynamics in nanostructures. The present paradigm of magnetic data storage is approaching its fundamental limits for areal storage density, as well as for speed in data …
Page 1 of 3