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arXiv · 1809.00415

Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet

Yuushou Hirata·Duck-Ho Kim·Se Kwon Kim·Dong-Kyu Lee·Se-Hyeok Oh·Dae-Yun Kim·Tomoe Nishimura·Takaya Okuno·Yasuhiro Futakawa·Hiroki Yoshikawa·Arata Tsukamoto·Yaroslav Tserkovnyak·Yoichi Shiota·Takahiro Moriyama·Sug-Bong Choe·Kyung-Jin Lee·Teruo Ono
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Abstract

Charged particles exhibit the Hall effect in the presence of magnetic fields. Analogously, ferromagnetic skyrmions with non-zero topological charges and finite fictitious magnetic fields exhibit the skyrmion Hall effect, which is detrimental for applications. The skyrmion Hall effect has been theoretically predicted to vanish for antiferromagnetic skyrmions because the fictitious magnetic field, proportional to net spin density, is zero. We experimentally confirm this prediction by observing current-driven transverse elongation of pinned ferrimagnetic bubbles. Remarkably, the skyrmion Hall effect, estimated with the angle between the current and bubble elongation directions, vanishes at the angular momentum compensation temperature where the net spin density vanishes. This study establishes a direct connection between the fictitious magnetic field and spin density, offering a pathway towards the realization of skyrmionic devices.

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Yuushou Hirata, Duck-Ho Kim, Se Kwon Kim, Dong-Kyu Lee, Se-Hyeok Oh, Dae-Yun Kim, Tomoe Nishimura, Takaya Okuno, Yasuhiro Futakawa, Hiroki Yoshikawa, Arata Tsukamoto, Yaroslav Tserkovnyak, Yoichi Shiota, Takahiro Moriyama, Sug-Bong Choe, Kyung-Jin Lee, Teruo Ono. 2018-09-03. Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet. https://doi.org/10.1038/s41565-018-0345-2

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