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  • 1
    Electronic Resource
    Electronic Resource
    A SYSTEMATIC APPROACH FOR EVALUATING AIRBORNE ELECTROMAGNETIC SYSTEMS (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 33 (1985), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Airborne electromagnetic methods have been in use for more than 30 years. The selection of the most effective airborne system for a given geological/geographical environment is difficult since there are only a limited number of theoretical comparisons and very few comparative field evaluations of the systems.Shell Canada Ltd carried out a field evaluation using several systems to provide such a comparison. For this evaluation five different airborne systems were flown over 22 conductive features. Some lines were flown at various directions to strike, some at various elevations, and some with different line spacings. The airborne systems were then evaluated target by target for navigational control, line-to-line correlation, resolution, lateral coverage, signal strength, noise etc.The paper examines the philosophy behind our field evaluation and outlines steps required for setting up this comparison. Pitfalls are discussed as well as examples which illustrate the methodology. Two field examples are given from the Bathrust mining camp in New Brunswick and the Timmins Clay belt in northern Ontario (both in Canada). Some general conclusions which help our understanding of present day airborne electromagnetic systems are discussed at the end of the paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1985.tb00769.x
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  • 2
    Electronic Resource
    Electronic Resource
    Prediction of optical disk tracking servo signals from surface microtopography measured by scanning tunneling microscopy (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 993-995 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Scanning tunneling microscopy (STM) was employed to measure the three-dimensional surface topography of radial servo grooves etched in a glass substrate. The effect of groove depth (nominal values of 20, 40, and 70 nm) on tracking servo signals at a track pitch of 1.6 μm is examined. Using an optical disk tester, three groove related signals were measured for each groove depth: the on-track signal ratio, cross-track ratio, and the push-pull ratio. In a key feature of this study, scalar diffraction theory was used to calculate the groove related signals from the STM profiles and the beam profile of the optical disk tester. The calculated groove related signals were found to be in nearly quantitative agreement with those measured with the disk tester.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141990
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic coercivity measurements in thin film recording media using a contact write/read tester (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5018-5020 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermally activated magnetization reversal processes become manifest in the dependence of the remanent coercivity on the time during which a magnetic field is applied opposite to the initial magnetization direction. They have important consequences for the long term stability and short time writeability of future high density recording media. In this paper, we report on a new experiment using a contact write/read tester to study the time dependence of the remanent coercivity over more than 10 orders of magnitude (from 6 ns to 〉60 s). Remanence coercivity and signal decay measurements of a CoPtCr recording medium with 5.5 nm thickness are presented. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370077
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  • 4
    Electronic Resource
    Electronic Resource
    Perforated tips for high-resolution in-plane magnetic force microscopy (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 909-911 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a technique to modify batch-fabricated magnetic force microscopy (MFM) tips to allow high resolution imaging of the in-plane components of stray field. A hole with a diameter as small as 20 nm was milled through the magnetic layer at the apex of each tip using a focused ion beam. The tips were magnetized in the direction parallel to the sample plane. The hole at the apex forms a small pole gap, and the MFM signal arises from interaction of the stray field leakage from this gap with magnetic charge distribution of the sample. Data tracks written in recording media have been used to characterize tip performance. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125626
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  • 5
    Electronic Resource
    Electronic Resource
    Writing and reading perpendicular magnetic recording media patterned by a focused ion beam (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 990-992 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have written and read bit patterns on arrays of square islands cut with a focused ion beam into granular perpendicular magnetic recording media. Using a static write–read tester, we have written square-wave bit patterns on arrays of islands with sizes between 60 and 230 nm, matching the recording linear density to the pattern period. These measurements reveal the onset of single-domain behavior for islands smaller than 130 nm, in agreement with magnetic force microscope images. The recording performance of patterned regions is systematically compared to that of unpatterned regions. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1347390
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  • 6
    Electronic Resource
    Electronic Resource
    Nanoscale replication for scanning probe data storage (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 4262-4264 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, there have been significant advances in demonstrating the possible application of scanning probe techniques for high density data storage. While many obstacles have yet to be overcome, one of the more promising applications of such devices is for very high density read-only disk drives. Such an application requires the means to pattern and replicate nanometer scale features over macroscopic dimensions. We have developed a technique for both mastering and replicating data patterns for use in such a device at a density 100 times that of current read-only disks. The process consists of using electron beam lithography to write data features as small as 50 nm and a photopolymerization process to faithfully replicate the written marks. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116965
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