arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.11573cond-mat.mtrl-sci
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手征磁体中自旋手征散射引起的巨反常霍尔效应

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… 展开作者

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

摘要:

通过导电电子与磁性的相互作用,可以显著增强电学霍尔效应,这被称为反常霍尔效应(AHE)。尽管与能带拓扑结构相关的机制已经被深入研究以实现节能电子学,但与电子散射相关的机制受到的关注有限。本文报道了在手征磁性锰锗薄膜中观察到的电子散射源的巨AHE。铁磁区的霍尔电导率和霍尔角分别达到40,000 Ω-1cm-1和18%,分别超过了传统的本征和非本征AHE的极限。大AHE的一个可能的起源是由于一种新的类型的斜散射通过热激发的自旋团簇与标量自旋手征,这是证实的温度-磁场分布的AHE是敏感的膜厚度或磁晶各向异性。我们的研究结果可能会开辟一个新的平台,探索巨大的AHE反应在各种系统,包括挫折磁铁和薄膜异质结构。

英文摘要:

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-1cm-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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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