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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Quantifying polycrystallinity effects on skyrmion dynamics and device performance.

Ahmet Bahadır Trabzon1,2, Arash Mousavi Cheghabouri3, Mehmet Cengiz Onbaşlı3,4

  • 1Department of Electrical and Electronics Engineering, Boğaziçi University, Bebek, Istanbul 34342, Turkey.

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|September 2, 2025
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Summary
This summary is machine-generated.

Polycrystallinity in magnetic films can pin skyrmions, hindering energy-efficient spintronic devices. Controlling material variations below 5% is crucial for robust skyrmion behavior and device performance.

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Area of Science:

  • Spintronics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Skyrmions are topologically protected spin textures with potential for energy-efficient spintronic devices.
  • Polycrystalline magnetic films introduce material inhomogeneities that can lead to skyrmion pinning, degrading device performance.

Purpose of the Study:

  • To quantify the impact of polycrystallinity-induced material parameter variations on skyrmion stability, dynamics, and hysteresis.
  • To establish quantitative tolerance thresholds for material uniformity in Co/Pt films for skyrmion-based devices.

Main Methods:

  • Micromagnetic modeling was employed to simulate skyrmion behavior in Co/Pt films with varying material parameters.
  • The study analyzed the effects of variability in saturation magnetization, Dzyaloshinskii-Moriya interaction, and uniaxial anisotropy.

Main Results:

  • Variations exceeding 5% in key material parameters significantly increase skyrmion pinning probability.
  • The impact of pinning is dependent on grain size and distribution within the magnetic film.
  • Quantitative tolerance thresholds for material uniformity were established.

Conclusions:

  • Stringent control over material uniformity and narrow grain size distributions are essential for pinning-free skyrmion operation.
  • Fabrication of highly uniform films is critical for realizing robust and efficient skyrmion-based spintronic devices.