Hirata Yuushou, Kim Duck-Ho, Kim Se Kwon, Lee Dong-Kyu, Oh Se-Hyeok, Kim Dae-Yun, Nishimura Tomoe, Okuno Takaya, Futakawa Yasuhiro, Yoshikawa Hiroki, Tsukamoto Arata, Tserkovnyak Yaroslav, Shiota Yoichi, Moriyama Takahiro, Choe Sug-Bong, Lee Kyung-Jin, Ono Teruo
Institute for Chemical Research, Kyoto University, Kyoto, Japan.
Department of Physics and Astronomy, University of California Los Angeles, California, CA, USA.
Nat Nanotechnol. 2019 Mar;14(3):232-236. doi: 10.1038/s41565-018-0345-2. Epub 2019 Jan 21.
In the presence of a magnetic field, the flow of charged particles in a conductor is deflected from the direction of the applied force, which gives rise to the ordinary Hall effect. Analogously, moving skyrmions with non-zero topological charges and finite fictitious magnetic fields exhibit the skyrmion Hall effect, which is detrimental for applications such as skyrmion racetrack memory. It was predicted that the skyrmion Hall effect vanishes for antiferromagnetic skyrmions because their fictitious magnetic field, proportional to net spin density, is zero. Here we investigate the current-driven transverse elongation of pinned ferrimagnetic bubbles. We estimate the skyrmion Hall effect from the angle between the current and the bubble elongation directions. The angle and, hence, the skyrmion Hall effect vanishes at the angular momentum compensation temperature where the net spin density vanishes. Furthermore, our study establishes a direct connection between the fictitious magnetic field and the spin density.
在磁场存在的情况下，导体中带电粒子的流动会从外加力的方向发生偏转，这就产生了普通的霍尔效应。类似地，具有非零拓扑电荷和有限虚拟磁场的移动斯格明子表现出斯格明子霍尔效应，这对诸如斯格明子赛道存储器等应用是不利的。据预测，反铁磁斯格明子的斯格明子霍尔效应会消失，因为它们与净自旋密度成正比的虚拟磁场为零。在此，我们研究了钉扎亚铁磁泡的电流驱动横向伸长。我们从电流与泡伸长方向之间的角度来估计斯格明子霍尔效应。在净自旋密度消失的角动量补偿温度下，该角度以及斯格明子霍尔效应都会消失。此外，我们的研究建立了虚拟磁场与自旋密度之间的直接联系。
