X-ray study of ferroic octupole order producing anomalous Hall effect

Recently found anomalous Hall, Nernst, magnetooptical Kerr, and spin Hall effects in the antiferromagnets Mn 3 X (X = Sn, Ge) are attracting much attention for spintronics and energy harvesting. Since these materials are antiferromagnets, the origin of these functionalities is expected to be differe...

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Bibliographic Details
Published in:Nature communications 2021-09, Vol.12 (1), p.5582-5582, Article 5582
Main Authors: Kimata, Motoi, Sasabe, Norimasa, Kurita, Kensuke, Yamasaki, Yuichi, Tabata, Chihiro, Yokoyama, Yuichi, Kotani, Yoshinori, Ikhlas, Muhammad, Tomita, Takahiro, Amemiya, Kenta, Nojiri, Hiroyuki, Nakatsuji, Satoru, Koretsune, Takashi, Nakao, Hironori, Arima, Taka-hisa, Nakamura, Tetsuya
Format: Article
Language:English
Subjects:
639/301/119/1001
639/301/119/997
Antiferromagnetism
Circular dichroism
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Cross correlation
Dichroism
Electromagnetism
Energy harvesting
Ferromagnetism
Germanium
Hall effect
Humanities and Social Sciences
Magnetic fields
magnetic materials
magnetic properties
Magnetism
Magnetization
MATERIALS SCIENCE
multidisciplinary
Multipoles
Physics
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Radiation
Science
Science (multidisciplinary)
Spectrum analysis
Spintronics
Tin
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Summary:Recently found anomalous Hall, Nernst, magnetooptical Kerr, and spin Hall effects in the antiferromagnets Mn 3 X (X = Sn, Ge) are attracting much attention for spintronics and energy harvesting. Since these materials are antiferromagnets, the origin of these functionalities is expected to be different from that of conventional ferromagnets. Here, we report the observation of ferroic order of magnetic octupole in Mn 3 Sn by X-ray magnetic circular dichroism, which is only predicted theoretically so far. The observed signals are clearly decoupled with the behaviors of uniform magnetization, indicating that the present X-ray magnetic circular dichroism is not arising from the conventional magnetization. We have found that the appearance of this anomalous signal coincides with the time reversal symmetry broken cluster magnetic octupole order. Our study demonstrates that the exotic material functionalities are closely related to the multipole order, which can produce unconventional cross correlation functionalities. The X-ray magnetic circular dichroism detection of magnetic octupole moment has not been experimentally demonstrated so far. Here, the authors observe ferroic order of magnetic octupole in Mn 3 Sn, finding the exotic material functionalities related to the multipole order.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-25834-7