Giant anomalous Hall effect from spin-chirality scattering in a chiral magnet

Yukako Fujishiro (), Naoya Kanazawa (), Ryosuke Kurihara, Hiroaki Ishizuka, Tomohiro Hori, Fehmi Sami Yasin, Xiuzhen Yu, Atsushi Tsukazaki, Masakazu Ichikawa, Masashi Kawasaki, Naoto Nagaosa, Masashi Tokunaga and Yoshinori Tokura ()
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Yukako Fujishiro: The University of Tokyo
Naoya Kanazawa: The University of Tokyo
Ryosuke Kurihara: The Institute for Solid State Physics (ISSP), The University of Tokyo
Hiroaki Ishizuka: The University of Tokyo
Tomohiro Hori: The University of Tokyo
Fehmi Sami Yasin: RIKEN Center for Emergent Matter Science (CEMS)
Xiuzhen Yu: RIKEN Center for Emergent Matter Science (CEMS)
Atsushi Tsukazaki: Institute for Materials Research (IMR), Tohoku University
Masakazu Ichikawa: The University of Tokyo
Masashi Kawasaki: The University of Tokyo
Naoto Nagaosa: The University of Tokyo
Masashi Tokunaga: The Institute for Solid State Physics (ISSP), The University of Tokyo
Yoshinori Tokura: The University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract The electrical Hall effect can be significantly enhanced through the interplay of the conduction electrons with magnetism, which is known as the anomalous Hall effect (AHE). Whereas the mechanism related to band topology has been intensively studied towards energy efficient electronics, those related to electron scattering have received limited attention. Here we report the observation of giant AHE of electron-scattering origin in a chiral magnet MnGe thin film. The Hall conductivity and Hall angle, respectively, reach $$40,000$$ 40 , 000 Ω−1 cm−1 and $$18$$ 18 % in the ferromagnetic region, exceeding the conventional limits of AHE of intrinsic and extrinsic origins, respectively. A possible origin of the large AHE is attributed to a new type of skew-scattering via thermally excited spin-clusters with scalar spin chirality, which is corroborated by the temperature–magnetic-field profile of the AHE being sensitive to the film-thickness or magneto-crystalline anisotropy. Our results may open up a new platform to explore giant AHE responses in various systems, including frustrated magnets and thin-film heterostructures.

Date: 2021
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DOI: 10.1038/s41467-020-20384-w

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