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Realization of skyrmion shift register.

Le Zhao1, Chensong Hua2, Chengkun Song1

  • 1State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China; Frontier Science Center for Quantum Information, Tsinghua University, Beijing 100084, China.

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Researchers developed novel magnetic skyrmion racetrack memory devices. These devices enable efficient, low-power data storage and processing by precisely controlling skyrmion movement at room temperature.

Keywords:
IndentationsRacetrack memorySkyrmionsSpintronicsSurface-topography

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • The increasing demand for data storage necessitates advanced nonvolatile, low-power memory technologies.
  • Magnetic skyrmions, a type of topological soliton, offer potential as information carriers for efficient processing.
  • Experimental realization of skyrmionic devices lags behind theoretical advancements.

Purpose of the Study:

  • To address experimental challenges in versatile skyrmionic device fabrication.
  • To demonstrate the controlled formation and manipulation of magnetic skyrmions for data storage applications.
  • To present a prototype shift register utilizing skyrmionic bits.

Main Methods:

  • Patterning Si/SiO2 substrates with concaved surface topography and indentations.
  • Fabricating Ta/CoFeB/MgO multilayer films to create a non-flat energy landscape.
  • Developing one-dimensional racetrack devices for deterministic skyrmion shifting.

Main Results:

  • Achieved formation of hexagonal and square skyrmion lattices.
  • Demonstrated long-distance, deterministic shifting of skyrmions between indentations at room temperature.
  • Presented a prototype shift register capable of generating and shifting complex skyrmionic data strings.

Conclusions:

  • Engineered non-flat energy landscapes facilitate controlled skyrmion lattice formation.
  • Deterministic skyrmion shifting in racetrack devices is feasible at room temperature.
  • These findings pave the way for transformative skyrmionic memory, logic, and in-memory computing devices.