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X-ray study of ferroic octupole order producing anomalous Hall effect
Motoi Kimata1, Norimasa Sasabe2, Kensuke Kurita3
1Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan. motoi.kimata.b4@tohoku.ac.jp.
Nature Communications
|September 23, 2021
Summary
Researchers observed magnetic octupole order in Mn3Sn, distinct from conventional magnetization. This finding explains exotic functionalities in antiferromagnets, crucial for spintronics and energy harvesting applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Antiferromagnetic materials like Mn3X exhibit anomalous Hall, Nernst, and spin Hall effects.
- These effects are promising for spintronics and energy harvesting.
- The origin of these phenomena in antiferromagnets differs from ferromagnets.
Purpose of the Study:
- To investigate the origin of exotic functionalities in Mn3Sn.
- To experimentally confirm the theoretical prediction of magnetic octupole order.
- To link multipole order to unconventional material properties.
Main Methods:
- X-ray magnetic circular dichroism (XMCD) was employed.
- XMCD signals were analyzed and compared with uniform magnetization.
- The appearance of anomalous signals was correlated with magnetic order.
Main Results:
- Ferroic order of magnetic octupole was observed in Mn3Sn.
- The observed XMCD signals were decoupled from uniform magnetization.
- The magnetic octupole order was found to break time-reversal symmetry.
Conclusions:
- The exotic functionalities in Mn3Sn arise from magnetic octupole order, not conventional magnetization.
- This multipole order is responsible for unconventional cross-correlation effects.
- The findings provide a new understanding of antiferromagnetic materials for advanced applications.
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