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  • Articles  (2)
  • Articles: DFG German National Licenses  (2)
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  • Articles  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Domain structures and dynamics near the backgap closure of thin-film heads : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5414-5416 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Statically unstable spikelike reversed magnetic domains emanating from the backgap closure of thin-film heads have been observed with high-frequency (1–20 MHz) and high-current amplitude (20–80 mA p-p) drive fields by using a wide-field magneto-optic domain observation system with a 10-nsec exposure time. The spikelike domains are repeatedly nucleated and annihilated within the drive cycle and do not remain after removal of the excitation. The formation of spikelike domains is due to the magnetization rotation back to the nearest easy directions after fanning out near the backgap closure to carry the spreading flux out of (or converging flux into) the backgap closure. The spikelike domains block the flux flow into and out of the backgap closure at excitation frequencies above 10 MHz due to the slow domain annihilation process. It is speculated that occasional failure of these spikelike domains to annihilate after a write pulse could lead to noise when they suddenly collapse during read out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347996
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  • 2
    Electronic Resource
    Electronic Resource
    Performance of magneto-optical recording media with direct overwrite capability (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3844-3846 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The feasibility of directly overwriting certain magneto-optical recording materials without the use of an external magnetic field has recently been demonstrated in our laboratory. In this report experiments to evaluate the beam positioning accuracy necessary for successful direct overwrite, the effects of static bias fields on the direct overwrite process, and the possibility of writing and erasing domains of arbitrary length on direct-overwrite materials are discussed. The data show that an error in beam positioning of at least 75% of the nominal domain diameter is tolerable for complete erasure without an external applied field. Application of particular values of dc bias field is shown to decrease the pulse width required to write while only slightly narrowing the allowed margin of erase pulse width, thus raising the allowed data rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340634
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    Paper (German National Licenses)
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