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  • American Physical Society  (67)
  • Springer  (64)
  • American Institute of Physics (AIP)  (22)
  • Oxford University Press
  • 1995-1999  (155)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Arrhenius–Néel thermal decay in polycrystalline thin film media (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4991-4993 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple expression for the remanent coercivity versus field time duration has been developed for polycrystalline thin film media with two-dimensional random anisotropy axis orientation. Explicit averaging of the thermally induced reversal for random grains is shown to be well approximated by the thermal decay of one particle with anisotropy axis at an angle of (approximate)21° to the applied field. The expression has no adjustable parameters and two slightly different forms apply to noninteracting and weakly interacting grains. Applicability is shown to be for times greater than approximately 100 ns. Good agreement is shown with measurements on two series of thin films with varying coating thickness. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370068
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetization reversal as a nonlinear multimode process (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5072-5074 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dynamic magnetization reversal has been simulated in a single grain for an instantaneously applied reversal magnetic field. The grain was considered as a system of n(=2,4,8) subgrains with uniaxial anisotropy coupled by exchange interaction. The gyromagnetic equations of motion were solved without phenomenological damping terms. The evolution of the magnetization was found to exhibit nonlinear spin wave excitation on a short timescale. The average magnetization significantly decreases and demonstrates irregular oscillations at a well defined mean value. The final stage of reversal is the spin-lattice damping on a longer time scale. The magnetic moment is, thereby, reassembled in a new equilibrium direction. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370094
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  • 3
    Electronic Resource
    Electronic Resource
    Pulsed gradient spin echo nuclear magnetic resonance measurements of hydrodynamic instabilities with coherent structure: Taylor vortices (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 11 (1999), S. 1104-1113 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsed gradient spin echo (PGSE) nuclear magnetic resonance (NMR) is applied to the characterization of hydrodynamic instabilities. It is demonstrated theoretically and experimentally that for Taylor vortex flow in a Couette cell the PGSE NMR data is coherently modulated in an interference pattern dependent upon the vortex size, or wavelength, and velocity intensity. Spatially resolved NMR velocity images of all three velocity components for water in supercritical Taylor number flow and NMR velocity image data of the axial disturbance velocity for pentane at three supercritical values of the Taylor number are presented. For the short column used the NMR velocity data clearly show axial asymmetry with maximum velocities and the center (eye) of the vortex drawn toward the radial outflow boundary. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869981
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  • 4
    Electronic Resource
    Electronic Resource
    Writing on perpendicular patterned media at high density and data rate (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5318-5320 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The feasibility of reversing single bit per particle media at a 1 GHz data rate with a density of 100 Gb/in.2 is examined. The media particles are cubic with 40 nm side length, 80 nm center to center spacing and perpendicular uniaxial anisotropy. Micromagnetic simulations are employed, and writing of data is done via an elongated probe to provide localized fields at the particle being reversed. The reversal of individual elongated particles is also examined with fields from a moving probe. A 1 GHz data rate appears to be more attainable with cubic particles than with elongated particles. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370238
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  • 5
    Electronic Resource
    Electronic Resource
    Micromagnetic modeling of magnetic anisotropy in textured thin-film media (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6411-6415 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Existing micromagnetic models, based on single domain grains that individually follow coherent rotation during reversal, have been utilized to study the effect of various texture-induced microstructures on the hysteretic behavior of Co-alloy thin films with circumferentially textured substrates. The roles of preferential orientation of Co c axes, grain elongation, and segregation, as well as possible short-range intergranular coupling, have been examined in an effort to understand the origins of widely observed magnetic anisotropy in these media. Preferential c-axis distribution along the track direction yields reasonable remanences and coercivities for both circumferential and radial loops, but the observed loop closure remains unaccounted for by c-axis distribution alone. Closely packed arrays of elongated grains maintain relative isotropy in terms of magnetostatic interactions, while voids along texture lines contribute to the magnetostatic anisotropy of the film. The limitations of the model are also discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359114
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental studies of nonlinearities in MR heads : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5883-5885 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetoresistive (MR) heads have been widely developed for high density digital magnetic recording. The nonlinear MR head response causes nonlinear distortion in the playback signals, and this results in a degradation of system performance. In this work, techniques for identifying the nonlinearity due to the playback process have been developed. Different levels of nonlinear distortion in the playback signals were observed for different head/disk combinations. The behavior of the MR nonlinear distortion as a function of flying height and recording density was also examined. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362161
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of nanostructured carbon microwires fabricated by an aerosol process (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 6046-6049 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanometer aerosol particles produced by laser ablation from a carbon target were used to fabricate wires about 50 μm in diameter by agglomeration in a dc field. We report measurements of the electrical properties of these wires. As the voltage applied across a wire increases the resistance of the wire decreases. At certain voltage settings, a rapid change in the electric current occurred, accompanied by a change in shape of the wire as observed with an optical microscope. The rapid change may result from an increase in wire density when the voltage reaches certain critical values. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360544
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  • 8
    Electronic Resource
    Electronic Resource
    Micromagnetic studies of inhomogeneous CoPtCr bicrystal thin-film media : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4916-4918 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of medium inhomogeneities in microstructure and exchange configuration are studied by using micromagnetic simulation. Two types of media are studied: one has a uniform bicrystal structure and another has a partial bicrystal structure with 20% random nonbicrystal sites. The comparison of magnetic (M-H loops) and recording properties (transition profiles and noise) for these two types of media are made under two cases with homogeneous or inhomogeneous intergranular exchange coupling. It is found that the introduction of random nonbicrystal sites reduces the medium noise in the case with homogeneous intergranular exchange, while medium noise is barely affected in the case with inhomogeneous intergranular exchange. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361586
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  • 9
    Electronic Resource
    Electronic Resource
    Signals and nonlinearities in thin metal-particle tape : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5661-5663 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new type of metal-particle tape, whose thickness is thinner and whose particles are better oriented than traditional thick particulate media, is simulated and analyzed. Signals at high densities are much larger in the thin tape than in the traditional tape. Nonlinearities at high densities are dominated by transition width increases. Signals and nonlinearities in even thinner media are studied versus record gap length to investigate proper system parameters. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362208
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental analysis of the effects of tape thickness on magnetic recording : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5658-5660 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Advances in magnetic tape recording have produced media with magnetic layers as thin as 0.1 μm. In this article, a metal particulate tape with a magnetic layer thickness of ∼0.37 μm is compared to a standard thick media tape with a magnetic layer thickness of ∼4 μm. Measurements of the isolated pulse are made and shown to compare well with micromagnetic simulations. The replay voltage versus current is measured with a 4 μm track width, shielded magnetoresistive head at various densities. The thin tape shows better high density response at high currents than the thick tape. The simulations show that the transitions are sharper on the thin tape due to both the reduction in thickness, and an improvement in the particle orientation. The better oriented particles yield narrower pulses, thereby improving the high frequency response of the tape. Frequency response measurements are also taken with the magnetoresistive head, which yield a signal to noise ratio of (approximately-greater-than)20 dB at 200 kfci. Last, overwrite performance versus current is compared for the two tapes plus a metal-evaporated (ME) tape with a 0.2 μm thick layer. A significant improvement in overwrite is seen on the ME tape. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362207
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