Adjustable Asymmetric Hysteresis Loop: Researchers develop methods to control magnetic inversion in Weyl Semimetal
Graphical abstract. Credit: Materials Physics Today (2025). doi: 10.1016/j.mtphys.2024.101642
Recently, the researchers have found a new way to control magnetic inversion with a special material called Co3SN2S2, a Weyl Semimetal. The team was led by the Hefei Physical Science of the Physical Science of the Physical Science of the Physical Science of the Physical Science of the Physical Science of the Physical Science of the Physical Science of the Chise Sciences Institutes, in collaboration with Professor Liu Enke of the Institutes of China Academy of Sciences.
“This discovery could help switch magnetization of devices that rely on magnetic properties,” says Professor Qu, “like hard drives and spin-based technologies.”
The results were published in Tailly Today Physics.
CO3SN2S2 is a magnetic weyl half with its unique structure, and its magnetic properties are linked to its topological features. The exchange bias (EB) effect, which is important for the stability of magnetic devices, has been observed in this material, but the exact mechanism behind it is still unknown.
Figure (A-D) Adjustable asymmetric hole loops at 5 K (magnetic history is shown in the inset). (e) Symmetrical loop under sufficient external magnetic field. (f) Sketching the effect of positively aligned local magnetic states on magnetic reversal. Credit: Zeng Qingqi
In this study, researchers found that magnetic inversion of materials can be controlled by adjusting the maximum external magnetic field (HMAX) and thermal history. When the HMAX was high enough, the forced field of material became symmetrical, causing EB-like behavior to disappear.
The researchers proposed that local magnetic states play an important role in adjustable magnetic inversion. Under certain inverted fields, these states form inverse magnetic domains and help lower the forced field. Once HMAX exceeds the critical value, these states will be in line with the direction of magnetization and will no longer affect the inversion process.
This finding provides a new explanation for the asymmetric hysteresis loop of CO3SN2S2, which differs from the usual EB effects. “By adjusting the maximum external magnetic field, we can control the magnetic inversion of a material and its magnetic and simultaneous properties, effectively adjusting the symmetry of the hysteresis loop,” said team member Dr. Zeng Qingqi.
Details: Asymmetric hysteresis loops due to hidden local magnetic states in Qing-Qi Zeng et al, Weyl Semimetal, Materials Today Physics (2025). doi: 10.1016/j.mtphys.2024.101642
Provided by the Chinese Academy of Sciences
Citation: Adjustable Asymmetric Hysteresis Loop: Researchers will develop a method to control magnetic inversion in Weyl Semimetal (2025, March 5), retrieved from https://phys.org/news from March 5, 2025.
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