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Researchers discovered a significant anomalous Hall effect in the magnetic material SrCo6O11 at temperatures above its magnetic transition, where it exhibits a phenomenon known as the “Spin-Fluctuating Devil’s Staircase.” This observation could revolutionize the design of materials for magneto-thermoelectric conversion, impacting the development of new thermoelectric materials.
Here’s a bit of background: When an electric current flows through a metal sample in a magnetic field, it experiences the Lorentz force. This force generates a voltage perpendicular to the magnetic field and current—a phenomenon referred to as the Hall effect.
In magnetic metals, a similar phenomenon—known as the anomalous Hall effect—may occur independently of an external magnetic field, particularly in ferromagnetic materials wherein electron spins are aligned. Generally, this alignment—and thus the anomalous Hall effect—only manifests below a certain temperature, known as the magnetic transition temperature.
Above this temperature, the spins become disordered, leading to the near disappearance of the anomalous Hall effect. Although the anomalous Hall effect can occur above the magnetic transition temperature when spins are aligned by an external magnetic field in theory, it is usually exceedingly weak.
Observations in SrCo6O11
In this study, the researchers observed a large anomalous Hall effect at temperatures exceeding the magnetic transition temperature in the magnetic material SrCo6O11, which exhibits a unique magnetic transition phenomenon known as the “Spin-Fluctuating Devil’s Staircase.”
Notably, the magnitude of the anomalous Hall effect—or the anomalous Hall angle—was among the largest recorded for magnetic oxides. The research suggests that this significant effect likely stems from the intense scattering of conduction electrons due to a specific type of spin fluctuation known as spin-flip fluctuation.
This large anomalous Hall effect has significant implications for the principle of magneto-thermoelectric conversion. The findings of this study provide a new principle for designing materials for this technology, which could have a substantial impact on the development of new thermoelectric conversion materials.
Reference: “Large anomalous Hall effect in spin fluctuating devil’s staircase” by Naoki Abe, Yuya Hano, Hiroaki Ishizuka, Yusuke Kozuka, Terumasa Tadano, Yoshihiro Tsujimoto, Kazunari Yamaura, Shintaro Ishiwata and Jun Fujioka, 17 May 2024, npj Quantum Materials.
DOI: 10.1038/s41535-024-00653-3
2 Comments
In this study, the researchers observed a large anomalous Hall effect at temperatures exceeding the magnetic transition temperature in the magnetic material SrCo6O11, which exhibits a unique magnetic transition phenomenon known as the “Spin-Fluctuating Devil’s Staircase.”
Very good.
Ask the researchers to think deeply:
1. Is the spin you observed related to topological spin?
2. Is topological spin a physical reality?
3. Why is contemporary physics so fond of using God, Angels, Devil, or even a strange Cat to describe science?
4. Can topological spin be a component of high-dimensional spacetime matter?
5. Is the spin of high-dimensional spacetime matter related to the spin of low dimensional spacetime matter?
and so on.
Scientific research guided by correct theories can help humanity avoid detours, failures, and pomposity. Please witness the exemplary collaboration between theoretical physicists and experimentalists (https://scitechdaily.com/microscope-spacecrafts-most-precise-test-of-key-component-of-the-theory-of-general-relativity/#comment-854286). Some people in contemporary physics has always lived in a self righteous children’s story world. Whose values have been overturned by such a comical and ridiculous reality? CP violation opened the dirtiest and ugliest era in the history of physics.
Space has physical properties of zero viscosity and absolute incompressibility. Zero viscosity and absolute incompressibility are physical characteristics of ideal fluids. The space with ideal fluid physical characteristics forms vortices via topological phase transitions, which is not difficult to understand mathematically. Once the topological vortex is formed, it occupies space and maintains its presence in time. This is the transition from chaos to order via two bidirectional coupled continuous chaotic systems.
Symmetry of topological vortex can be used to explore particle behavior under spatial, temporal, and quantum number reversals, involving quantum gravity, discrete and continuous changes. It underpins the consistency of natural laws and experiment reproducibility.
The perpetually swirling topological vortices defy traditional physics’ expectations potentially unveiling new particles and forces, and can have an heavily influencing to traditional physics theories.
If researchers are interested, you can browse https://scitechdaily.com/microscope-spacecrafts-most-precise-test-of-key-component-of-the-theory-of-general-relativity/#comment-856294.
What evidence does the author provide to support their claim, and how does this evidence thus strengthen their overall argument?, regard Telkom University