The anomalous Hall effect is a phenomenon that occurs in magnetic metals, where a voltage is generated perpendicular to the magnetic field and current flow. This effect is usually observed in ferromagnetic materials, where electron spins are aligned. The alignment of spins leads to the manifestation of the anomalous Hall effect below a specific temperature known as the magnetic transition temperature.
A research group from the University of Tsukuba has made a groundbreaking discovery regarding the anomalous Hall effect during phase transition. The researchers found that in the magnetic material SrCo6O11, a unique magnetic transition phenomenon called “spin-fluctuating devil’s staircase” triggers a large anomalous Hall effect at temperatures exceeding the magnetic transition temperature. This effect, characterized by intense scattering of conduction electrons due to spin-flip fluctuation, is among the largest recorded for magnetic oxides.
The significant anomalous Hall effect observed in the research has profound implications for magneto-thermoelectric conversion technology. By understanding the role of electron spin fluctuations in triggering this effect, researchers can now explore new principles for designing materials for this innovative power generation technology. The development of new thermoelectric conversion materials could be greatly influenced by the findings of this study.
The research conducted by the University of Tsukuba sheds light on the importance of electron spin fluctuations in the anomalous Hall effect and its impact on magneto-thermoelectric conversion. The discovery of the devil’s staircase magnetic transition provides a new avenue for exploring the potential of this environmentally friendly power generation technology. By delving into the underlying mechanisms of this complex phenomenon, scientists can pave the way for the development of advanced materials for thermoelectric conversion.
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