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; Yoshinori Tokura

doi:10.1038/s41467-020-20384-w

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, Yoshinori Tokura

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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 Ω⁻¹ cm⁻¹ and 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.

Original language	English
Article number	317
Journal	Nature Communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-020-20384-w
State	Published - Dec 2021
Externally published	Yes

Funding

The authors thank A. Kitaori and M. Mogi for experimental supports and fruitful discussions. This research was supported in part by JSPS KAKENHI (Grants No. JP18J20959, No. JP20H05155, No. JP20H01859, and No. JP20H01867) and JST CREST (Grants No. JPMJCR16F1 and No. JPMJCR1874).

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title = "Giant anomalous Hall effect from spin-chirality scattering in a chiral magnet",

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 Ω−1 cm−1 and 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.",

author = "Yukako Fujishiro and Naoya Kanazawa and Ryosuke Kurihara and Hiroaki Ishizuka and Tomohiro Hori and Yasin, {Fehmi Sami} and Xiuzhen Yu and Atsushi Tsukazaki and Masakazu Ichikawa and Masashi Kawasaki and Naoto Nagaosa and Masashi Tokunaga and Yoshinori Tokura",

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doi = "10.1038/s41467-020-20384-w",

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AU - Fujishiro, Yukako

AU - Kanazawa, Naoya

AU - Kurihara, Ryosuke

AU - Ishizuka, Hiroaki

AU - Hori, Tomohiro

AU - Yasin, Fehmi Sami

AU - Yu, Xiuzhen

AU - Tsukazaki, Atsushi

AU - Ichikawa, Masakazu

AU - Kawasaki, Masashi

AU - Nagaosa, Naoto

AU - Tokunaga, Masashi

AU - Tokura, Yoshinori

PY - 2021/12

Y1 - 2021/12

N2 - 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 Ω−1 cm−1 and 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.

AB - 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 Ω−1 cm−1 and 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.

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VL - 12

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

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