Overwrite and track edges in high-density tape recording - simulations and analysis

S. Lalbahadoersing

    Abstract

    In this work the study of digital information storage on tape takes a central place. Hereby a current is applied to the inductive head, which generates a magnetic field at the head gap. Depending on the field direction, the medium can be magnetized in a direction (anti)parallel to the tape motion. In this way it becomes possible to write a specific signal on a magnetic coating. The tendency to realize higher information storage densities in a smaller area, draws the attention of system designers strongly at the study of the parameters influencing the write and read process. In this thesis we more closely look at these parameters. The emphasis lies on the overwrite behavior. Herewith is meant the extent to which residues of the original signals, after it has been overwritten with new information, influence the new information. Further, track edges of partially overwritten tracks on a particulate and thin-film tapes have been studied. This analysis is of high importance for the understanding of the recording behavior at high track density. A limiting factor for high track density is the bad track edge definition. The thesis consists of two parts. The first part gives a recapitulation of the experimental and theoretical environment around which this research took place. In the second part (chapter 5 – chapter 9) the results are shown. After a general introduction a treatise is given of most important facets of recording theory. This is followed by a description of the experimental methods in chapter 3. Chapter 4 gives a synopsis of the model used, which is equipped with a hysteresis model, called the Moving-Preisach Stoner-Wohlfarth model. In chapter 5 a particulate tape is analyzed with respect to signal output and overwrite behavior. Modulation of the new signal (l = 0.5 mm) by the original signal and residual signals in deeper layers of the magnetic coating are responsible for the overwrite behavior. These two effects are closely linked to each other. Applying larger currents to the inductive head result in larger write fields, which penetrate the magnetic coating more deeply. This effects in improvement of overwrite behavior. The wavelength dependence on overwrite shows that long wavelengths are more difficult to overwrite than short ones. Reduction of the (magnetic) coating thickness improves also the overwrite behavior. Furthermore, by modeling the influences of particle orientation, switching field distribution, coercivity, magnetization in the magnetic coating, the head-medium spacing, and gap length have been studied.
    Original languageUndefined
    Supervisors/Advisors
    • Advisor
    • Luitjens, S.B., Supervisor
    • Advisor
    Date of Award1 Oct 1999
    Place of PublicationEnschede
    Publisher
    Print ISBNs90 365 1374 x
    StatePublished - Oct 1999

    Fingerprint

    coatings
    tapes
    theses
    particulates
    recording
    wavelengths
    coercivity
    flat surfaces
    tendencies
    hysteresis
    spacing
    rocks
    modulation
    magnetization
    output
    thin films
    magnetic fields

    Keywords

    • SMI-REC: RECORDING
    • EWI-5336
    • SMI-TST: From 2006 in EWI-TST

    Cite this

    Lalbahadoersing, S. (1999). Overwrite and track edges in high-density tape recording - simulations and analysis Enschede: Twente University Press (TUP)
    Lalbahadoersing, S.. / Overwrite and track edges in high-density tape recording - simulations and analysis. Enschede : Twente University Press (TUP), 1999. 185 p.
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    Overwrite and track edges in high-density tape recording - simulations and analysis. / Lalbahadoersing, S.

    Enschede : Twente University Press (TUP), 1999. 185 p.

    Research output: ScientificPhD Thesis - Research UT, graduation UT

    TY - THES

    T1 - Overwrite and track edges in high-density tape recording - simulations and analysis

    AU - Lalbahadoersing,S.

    N1 - Imported from SMI Theses

    PY - 1999/10

    Y1 - 1999/10

    N2 - In this work the study of digital information storage on tape takes a central place. Hereby a current is applied to the inductive head, which generates a magnetic field at the head gap. Depending on the field direction, the medium can be magnetized in a direction (anti)parallel to the tape motion. In this way it becomes possible to write a specific signal on a magnetic coating. The tendency to realize higher information storage densities in a smaller area, draws the attention of system designers strongly at the study of the parameters influencing the write and read process. In this thesis we more closely look at these parameters. The emphasis lies on the overwrite behavior. Herewith is meant the extent to which residues of the original signals, after it has been overwritten with new information, influence the new information. Further, track edges of partially overwritten tracks on a particulate and thin-film tapes have been studied. This analysis is of high importance for the understanding of the recording behavior at high track density. A limiting factor for high track density is the bad track edge definition. The thesis consists of two parts. The first part gives a recapitulation of the experimental and theoretical environment around which this research took place. In the second part (chapter 5 – chapter 9) the results are shown. After a general introduction a treatise is given of most important facets of recording theory. This is followed by a description of the experimental methods in chapter 3. Chapter 4 gives a synopsis of the model used, which is equipped with a hysteresis model, called the Moving-Preisach Stoner-Wohlfarth model. In chapter 5 a particulate tape is analyzed with respect to signal output and overwrite behavior. Modulation of the new signal (l = 0.5 mm) by the original signal and residual signals in deeper layers of the magnetic coating are responsible for the overwrite behavior. These two effects are closely linked to each other. Applying larger currents to the inductive head result in larger write fields, which penetrate the magnetic coating more deeply. This effects in improvement of overwrite behavior. The wavelength dependence on overwrite shows that long wavelengths are more difficult to overwrite than short ones. Reduction of the (magnetic) coating thickness improves also the overwrite behavior. Furthermore, by modeling the influences of particle orientation, switching field distribution, coercivity, magnetization in the magnetic coating, the head-medium spacing, and gap length have been studied.

    AB - In this work the study of digital information storage on tape takes a central place. Hereby a current is applied to the inductive head, which generates a magnetic field at the head gap. Depending on the field direction, the medium can be magnetized in a direction (anti)parallel to the tape motion. In this way it becomes possible to write a specific signal on a magnetic coating. The tendency to realize higher information storage densities in a smaller area, draws the attention of system designers strongly at the study of the parameters influencing the write and read process. In this thesis we more closely look at these parameters. The emphasis lies on the overwrite behavior. Herewith is meant the extent to which residues of the original signals, after it has been overwritten with new information, influence the new information. Further, track edges of partially overwritten tracks on a particulate and thin-film tapes have been studied. This analysis is of high importance for the understanding of the recording behavior at high track density. A limiting factor for high track density is the bad track edge definition. The thesis consists of two parts. The first part gives a recapitulation of the experimental and theoretical environment around which this research took place. In the second part (chapter 5 – chapter 9) the results are shown. After a general introduction a treatise is given of most important facets of recording theory. This is followed by a description of the experimental methods in chapter 3. Chapter 4 gives a synopsis of the model used, which is equipped with a hysteresis model, called the Moving-Preisach Stoner-Wohlfarth model. In chapter 5 a particulate tape is analyzed with respect to signal output and overwrite behavior. Modulation of the new signal (l = 0.5 mm) by the original signal and residual signals in deeper layers of the magnetic coating are responsible for the overwrite behavior. These two effects are closely linked to each other. Applying larger currents to the inductive head result in larger write fields, which penetrate the magnetic coating more deeply. This effects in improvement of overwrite behavior. The wavelength dependence on overwrite shows that long wavelengths are more difficult to overwrite than short ones. Reduction of the (magnetic) coating thickness improves also the overwrite behavior. Furthermore, by modeling the influences of particle orientation, switching field distribution, coercivity, magnetization in the magnetic coating, the head-medium spacing, and gap length have been studied.

    KW - SMI-REC: RECORDING

    KW - EWI-5336

    KW - SMI-TST: From 2006 in EWI-TST

    M3 - PhD Thesis - Research UT, graduation UT

    SN - 90 365 1374 x

    PB - Twente University Press (TUP)

    ER -

    Lalbahadoersing S. Overwrite and track edges in high-density tape recording - simulations and analysis. Enschede: Twente University Press (TUP), 1999. 185 p.