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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Stable ultrahigh-density magneto-optical recordings using introduced linear defects.

L Krusin-Elbaum1, T Shibauchi, B Argyle

  • 1IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA. krusin@us.ibm.com

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|March 22, 2001
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Summary

Magnetic recording media stability is improved by controlling magnetic domain walls. Strain from linear defects smooths domain walls, enabling data storage densities exceeding 1 Terabit per square inch.

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Area of Science:

  • Materials Science
  • Physics
  • Data Storage

Background:

  • Data bit stability in magnetic recording media is limited by thermal magnetic spin reversals at high densities.
  • Perpendicularly magnetized media offer improved stability, with magneto-optical memories showing promise for ultrahigh-density recording (approx. 100 Gbit/in²).
  • Domain wall roughness and mobility hinder closer bit packing and higher densities.

Purpose of the Study:

  • To investigate methods for overcoming domain wall limitations in magnetic recording media.
  • To explore the potential of engineered defects to enhance magnetic domain wall behavior.
  • To identify pathways for achieving data storage densities beyond 1 Terabit per square inch.

Main Methods:

  • Investigated the effect of strain from linear defects in magnetic thin films on domain wall properties.
  • Utilized scaling analysis based on the physics of disorder-controlled elastic lines.
  • Performed experiments on ultrathin cobalt films and multilayered structures.

Main Results:

  • Strain imposed by linear defects effectively smooths rough magnetic domain walls over large areas (hundreds of micrometres).
  • Defect-induced strain also significantly halts domain wall motion.
  • Demonstrated a method to prepare magnetic media for enhanced data storage.

Conclusions:

  • Engineered strain via linear defects offers a viable strategy to control magnetic domain walls.
  • This approach can overcome current limitations in bit packing density.
  • Potential exists for magnetic media to achieve data storage densities exceeding 1 Terabit per square inch.