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Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular magnetic anisotropy
Wenbo Wang1, Matthew W Daniels2,3, Zhaoliang Liao4,5
1Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA.
Nature Materials
|August 14, 2019
Summary
Spin chirality fluctuations were observed above the Curie temperature in 2D ferromagnets, evidenced by the topological Hall effect (THE). This finding suggests spin chirality fluctuations are common in these materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Non-coplanar spin textures with scalar spin chirality generate effective magnetic fields, leading to the topological Hall effect (THE).
- Spin chirality fluctuations in two-dimensional (2D) ferromagnets with perpendicular magnetic anisotropy have not been previously investigated.
Purpose of the Study:
- To investigate spin chirality fluctuations in 2D ferromagnets.
- To probe the topological Hall effect (THE) above the Curie temperature in specific ferromagnetic thin films.
Main Methods:
- Experimental probing of the topological Hall effect (THE) in SrRuO3 and V-doped Sb2Te3 ultra-thin films.
- Analysis of THE signal dependence on temperature, magnetic field, thickness, and carrier type.
- Monte Carlo simulations to support experimental findings.
Main Results:
- Evidence of spin chirality fluctuations was observed above the Curie temperature in both SrRuO3 and V-doped Sb2Te3.
- The topological Hall effect (THE) signal exhibited clear dependencies on temperature, magnetic field, film thickness, and carrier type.
- Monte Carlo simulations corroborated the experimental observations of spin chirality fluctuations.
Conclusions:
- Spin chirality fluctuations are a common phenomenon in 2D ferromagnets with perpendicular magnetic anisotropy.
- The study opens new avenues for exploring spin chirality using topological Hall transport in 2D magnetic materials.
- Findings contribute to the understanding of exotic magnetic phenomena in low-dimensional systems.
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