Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet
Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet
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DOI：
10.1038/s41565-018-0345-2
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发表时间：
2019-03-01
影响因子：
38.3
通讯作者：
Ono, Teruo
中科院分区：
文献类型：
--
作者：
Hirata, Yuushou;Kim, Duck-Ho;Ono, Teruo
在磁场存在的情况下，导体中的带电粒子流从所施加的力的方向偏转，这引起了普通的霍尔效应。类似地，具有非零拓扑电荷和有限虚拟磁场的运动skyrmion表现出skyrmion霍尔效应，这对于诸如skyrmion赛道存储器的应用是有害的。据预测，Skyrmion霍尔效应消失的反铁磁Skyrmion，因为他们的虚拟磁场，净自旋密度成正比，是零。在这里，我们研究了电流驱动的钉扎亚铁磁泡的横向伸长。我们从电流方向和气泡伸长方向之间的角度来估计Skyrmion Hall效应。角，因此，斯基尔米恩霍尔效应消失在角动量补偿温度，净自旋密度消失。此外，我们的研究建立了虚磁场和自旋密度之间的直接联系。
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.