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  • 1
    Electronic Resource
    Electronic Resource
    Edge detection readout signal and cross talk in phase-change optical data storage (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 3422-3424 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Readout signal, noise, and cross-track cross talk were investigated for edge detection in a phase-change optical data storage system. Both theoretical and experimental results indicate that edge detection has a performance superior to the conventional detection of reflectance variations, especially when the amorphous marks are shorter than the size of the focused spot. More than 50 dB of carrier to noise ratio for marks of 0.36 μm in length is obtained using light at a wavelength of 690 nm and an objective lens of 0.6 numerical aperture. Diffraction analysis on the cross talk has shown that, in the scheme of land-groove recording, there is no optimum groove depth which can cancel the cross talk from adjacent tracks. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121653
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  • 2
    Electronic Resource
    Electronic Resource
    Barkhausen jumps during domain wall motion in thin magneto-optical films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5667-5669 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method with high spatial resolution is developed to study wall motion in thin magnetic films with perpendicular anisotropy. Barkhausen jumps during domain wall motion in amorphous TbFeCo films and polycrystalline Co/Pd multilayer films have been observed. The average distance between strong pinning sites in Co/Pd was found to be around 0.3–0.4 μm. Maximum pinning times as long as several seconds were observed. Magnitudes of major jumps in TbFeCo were around 0.7 μm. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362210
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetoresistance peaks in the neighborhood of coercivity in magneto-optical recording media (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1528-1538 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Perpendicular magnetoresistance data performed on magneto-optical samples with uniaxial magnetic anisotropy (perpendicular to the film plane) show a change of the resistance ΔR/R when the applied field reaches the coercive field. The various mechanisms that can lead to this phenomenon are investigated based on different magneto-optical films. In particular, the interaction of magnetic domains and domain walls with the electric current is interesting. Separating the two effects is important to understanding of the various galvanomagnetic and magnetic processes in these films. Three different mechanisms are considered in order to explain the data: The first mechanism is associated with the Hall effect, the second mechanism involves the anisotropic resistivity, and the third mechanism is related to the s-d scattering effect. Some of the experimental results are explained by modeling the current and electric-field distribution in these films. In the simulations the film is modeled by a two- or three-dimensional lattice with each branch in the lattice having its own resistivity tensor in order to simulate magnetic domains and domain walls in the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351721
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  • 4
    Electronic Resource
    Electronic Resource
    Magneto-optical recording on patterned substrates (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5687-5692 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Patterning of glass or plastic substrates in the form of shallow square patches is a promising method of increasing the storage density for magneto-optical disks. The sidewalls of the patches pin the reverse-magnetized domains that develop in these samples. Confinement of domains within the patch boundaries during thermomagnetic recording has also been demonstrated. We have measured polarization conversion of the incident light on the sidewalls of the patches; a method to reduce the amount of such polarization conversion is proposed in this article. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362218
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  • 5
    Electronic Resource
    Electronic Resource
    A dynamic study of domain formation mechanism during thermomagnetic recording based on micro-Hall effect measurements : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5700-5702 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method for analyzing the dynamics of domain formation during the thermomagnetic recording process has been developed based on the extraordinary Hall effect. A magnetic domain is written at the center of a cross-shaped magneto-optical sample having an area of 5×5 μm2, and the Hall voltage is monitored during the recording process. As far as domain nucleation is concerned, we find that the temperature gradient around the transition region (i.e., the region whose temperature is between the critical temperature for magnetization reversal and the Curie point) is very important. Under the conditions of high power and short pulse-width laser, a domain can form only during the cooling period. However, it is possible for a domain to form during the heating cycle under a low power, long pulse laser beam. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362222
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  • 6
    Electronic Resource
    Electronic Resource
    Assessment of local variations in the coercivity of magneto-optical media : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6838-6840 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Locally varying deposition conditions and substrate characteristics of magneto-optic media may alter the domain nucleation, growth, and collapse mechanisms of the film. The use of a static tester and basic image processing equipment permits qualitative observations of anomalous domain nucleation, growth, and collapse phenomena. We present example images for a Co/Pt sample and several TbFeCo films that depict symmetrical domain expansion and collapse, directional preference for domain wall motion, domain collapse from submicroscopic domain remnants, and anomalous domain nucleation and expansion as a function of position on the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352453
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of canting on the measured magnetic anisotropy constant for magneto-optical recording media (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5794-5794 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental data of the intrinsic perpendicular magnetic anisotropy energy constant Ku are presented for amorphous rare-earth–transition metal (RE–TM) Tbx(FeCo)1−x and multilayered Co/Pt thin film samples. These data were independently measured using five techniques based on torque magnetometry, the extraordinary Hall effect, and the magneto-optic Kerr effect. In the Hall effect measurement, the external field was applied to the sample in three different ways: fixed at 45° from the film normal; rotating around the sample; and fixed along the in-plane direction. The results obtained with these techniques agree with each other for the Co/Pt samples. However, we do find systematic differences in the measured Ku for the Tbx(FeCo)1−x samples. For example, Ku given by the Hall effect and Kerr effect is always larger (by up to a factor of 3) than that given by torque technique. Another interesting fact is that Ku given by the Hall effect technique drops as x approaches the compensation point xc in the TM-dominant case, but increases as x approaches xc in the RE-dominant case. These experimental results are explained by taking into account the canting between RE and TM subnetworks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353578
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  • 8
    Electronic Resource
    Electronic Resource
    Coercivity of magnetic domain wall motion near the edge of a terrace (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 380-386 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Domain wall motion near the edges of terraces (e.g., grooves, pits, plateaus, etc.) is studied using analytical techniques based on the minimum energy principle and computer simulations based on the dynamic Landau–Lifshitz–Gilbert equation. One-dimensional lattices of magnetic dipoles with variations either of the easy axis direction (corresponding to a tilt of the anisotropy axis at the edge) or of the nearest-neighbor exchange force (corresponding to a changing film thickness) are considered. We show that the coercivity caused by the terrace edge could be as large as several kilo Oe. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360611
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  • 9
    Electronic Resource
    Electronic Resource
    Coercivity mechanisms in magneto-optical recording media (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5792-5792 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper is devoted to an explanation of why the coercivity is much lower than the macroscopic anisotropy field (Brown paradox). The effect of nanostructure on the nucleation coercivity Hnc and wall motion coercivity Hwc is investigated using connection machine simulations. The magneto-optical (MO) thin films with inhomogeneities are modeled by a patchy two-dimensional lattice. The patches have random shape and size; the anisotropy constant fluctuates randomly from patch to patch; the exchange strength is uniform within the patches, but fluctuates at the patch borders. We have simulated various nucleation and wall motion processes on more than a dozen patchy lattices, with the average patch size d ranging from 60 to 300 A(ring). In all cases the average domain wall width δ(approximately-equal-to)120 A(ring). Some of our results are the following: (i) As d increases, Hnc decreases fast for d〈δ, but slowly for d(approximately-greater-than)δ. (ii) Hnc decreases with decreasing exchange strength at the patch borders. (iii) Hwc in films of small patches (d≤δ) is greater than that in films of large patches (d(approximately-greater-than)δ). (iv) Hwc increases with decreasing exchange coupling at the patch borders. Our results show that the scale of inhomogeneity responsible for the low Hnc in MO thin films ranges from 100 to 200 A(ring). This work extends the previous work on nucleation1 and pinning2 mechanisms in several respects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353576
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  • 10
    Electronic Resource
    Electronic Resource
    Erasable optical disks for data storage: principles and applications (1985)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 24 (1985), S. 80-84 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i300017a015
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