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Local thermoelectric response from a single Néel domain wall.

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Researchers developed a new method to detect magnetic domain walls with high resolution. This technique uses a heated scanning probe to uniquely identify different types of domain walls at the nanoscale.

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Area of Science:

  • Spintronics and spin caloritronics
  • Nanoscale materials science
  • Thermoelectric phenomena

Background:

  • Spatially resolved thermoelectric detection is crucial for studying spintronic and spin caloritronic effects.
  • Previous methods were limited by resolution, restricting analysis to uniform or collinear magnetic regions.
  • Investigating nanoscale thermoelectric responses requires advanced imaging techniques.

Purpose of the Study:

  • To develop a high-resolution method for detecting thermoelectric responses from single magnetic domain walls.
  • To distinguish between different types of domain wall structures (Bloch vs. Néel) at the nanoscale.
  • To enable the characterization of complex noncollinear spin textures.

Main Methods:

  • Utilizing a heated scanning probe to measure local thermoelectric signals.
  • Analyzing the thermoelectric response from a single trapped magnetic domain wall.
  • Combining experimental data with analytical and thermal micromagnetic modeling.

Main Results:

  • Unambiguously resolved a single domain wall through its distinct local thermoelectric response.
  • Identified the thermoelectric signature as characteristic of a Néel-like domain wall.
  • Demonstrated sensitivity to the domain wall's rotational plane for nanoscale identification.

Conclusions:

  • The heated scanning probe technique allows for nanoscale resolution of thermoelectric signals from domain walls.
  • This method can differentiate between Bloch and Néel domain walls based on their thermoelectric signatures.
  • The approach offers a pathway for identifying and characterizing various noncollinear spin textures.