2021 Fiscal Year Research-status Report
Electrical manipulation of Antiferromagnetic State in Non-centrosymmetric Systems
| Project/Area Number |
21K13873
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
ヌイェン カーン 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (50775608)
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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Keywords | Magnetism / Antiferromagnet / Symmetry Breaking / Nonreciprocal transport |
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| Outline of Annual Research Achievements |
In this work, we aim to investigate the physical response in chiral lattice antiferromagnet CoNb3S6 via two topics: (1st) manipulation of AFM states with electric current and (2nd) non-reciprocal transport phenomena. For the 1st target, we have successfully fabricated the micro-device and performed the measurement using DC current to switch antiferromagnetic states. At the current stage, the device exhibits the switching behavior when applying large pulsed DC current, which can be evaluated via the value of Hall resistivity acquired after passing current pulse. As for the 2nd target, we have observed various type of non-reciprocal transport phenomena in bulk and FIB samples of CoNb3S6 associated with AFM state, including assymetric magnetoresistance and electrical magneto-chiral effect.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
According to the initial plan, we have successfully fabricated the FIB device, which plays important role in realization of research targets. By using FIB device, we can increase the current density and reduce the effect of heating, which allows to observe various kinds of phenomena, including switching using DC current as well as electrical magnetochiral effect.
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| Strategy for Future Research Activity |
As for the future plan, although we have observed the switching behavior of AFM states, the deterministic manipulation still has not been achieved yet. One of the possible reasons is because of heating, which may induce the random nucleation. To overcome this issue, we plan to improve the FIB technique to fabricate thinner sample and improve the contact between sample and substrate, which helps further increase current density and lower the heating effect. We also would like to collaborate with theorist to have qualitative explanation for the observation of non-reciprocal transport phenomena associated with AFM state.
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| Causes of Carryover |
Due to the effect of COVID-19 pandemic, some of the product cannot be purchased, as well as some conference was cancelled. We would like to transfer this funding amount to next fiscal year to buy other equipment.
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[Journal Article] Zoology of Multiple-Q Spin Textures in a Centrosymmetric Tetragonal Magnet with Itinerant Electrons2022
Author(s)
Nguyen Duy Khanh, Taro Nakajima, Satoru Hayami, Shang Gao, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Rina Takagi, Yukitoshi Motome, Yoshinori Tokura, Taka-hisa Arima, Shinichiro Seki
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Journal Title
Advanced Science
Volume: 9
Pages: 2105452
DOI
Peer Reviewed / Open Access / Int'l Joint Research
