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Directly deposited bit-patterned media (BPM) shows magnetically isolated bits at pitches of 30 nm or less. This indicates direct deposition is a promising fabrication approach for high-density magnetic recording.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Bit-patterned media (BPM) offer a path to higher magnetic recording areal density.
  • Direct deposition of magnetic material onto nanopillars is a key BPM fabrication technique.
  • Controlling magnetic interactions between bits and trench material is crucial for BPM performance.

Purpose of the Study:

  • To investigate magnetic interactions in Co-Pd multilayer-based BPM fabricated by direct deposition.
  • To determine the presence and relative intensities of exchange and dipolar interactions.
  • To assess the suitability of direct deposition for high-density magnetic recording.

Main Methods:

  • Fabrication of Co-Pd multilayer-based BPM using direct deposition.
  • Utilized magnetic force microscopy (MFM) for nanoscale magnetic imaging.
  • Employed variable-angle magneto-optic Kerr effect (V-MOKE) and remanence curves for magnetic characterization.

Main Results:

  • Identified and quantified exchange and dipolar interactions in the fabricated BPM.
  • Found negligible exchange interactions for pitches of 30 nm or less.
  • Demonstrated magnetic isolation of bits at higher recording densities.

Conclusions:

  • Direct deposition of magnetic material onto nanopillars results in magnetically isolated bits at small pitches.
  • The absence of significant exchange interactions supports the viability of this method for high-density BPM.
  • Direct deposition is a promising approach for fabricating advanced bit-patterned media for future storage technologies.