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Decoding the magnetic bit positioning error in a ferrimagnetic racetrack.

Mio Ishibashi1, Masashi Kawaguchi1, Yuki Hibino2

  • 1Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan.

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|October 23, 2024
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Summary
This summary is machine-generated.

This study quantifies bit positioning errors during magnetic domain wall writing and shifting in Pt/GdFeCo bilayers, crucial for reliable storage class memory. Results show small, manageable errors, enabling dense magnetic domain wall packing.

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Area of Science:

  • Spintronics
  • Materials Science
  • Non-volatile Memory Technologies

Background:

  • Current-driven magnetic domain wall motion is vital for advanced memory devices like storage class memory.
  • Existing research focuses on high-speed and low-power domain wall propagation, but reliability remains under-explored.
  • Understanding operational errors is critical for practical implementation of domain wall-based memory.

Purpose of the Study:

  • To investigate and quantify errors in writing and shifting magnetic domain walls using short current pulses.
  • To assess the reliability of domain wall operations in a Pt/GdFeCo bilayer system.
  • To determine the feasibility of highly packed domain walls in ferrimagnetic racetracks.

Main Methods:

  • Utilized nanosecond current pulses to write and shift magnetic domain walls in a ~5-micrometer-wide Pt/GdFeCo wire.
  • Measured bit positioning errors associated with writing domain walls at the wire edge.
  • Quantified errors during the domain wall shifting process and analyzed error correlation.

Main Results:

  • Writing a domain wall at the wire edge resulted in a bit positioning error of approximately 0.3 micrometers.
  • Shifting operations induced an error of approximately 0.1 micrometers per 2-nanosecond current pulse.
  • Error correlation between successive shifts was found to be negligible under sufficiently large current drives.

Conclusions:

  • The study successfully decoded errors in magnetic domain wall operations, providing critical reliability data.
  • Identified error magnitudes suggest that reliable operation of highly packed domain walls is achievable.
  • Findings support the potential of ferrimagnetic racetracks for dense and reliable data storage.