Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet.,Nature Nanotechnology

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Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet.
Nature Nanotechnology ( IF 38.1 ) Pub Date : 2019-01-21 , DOI: 10.1038/s41565-018-0345-2
Yuushou Hirata ₁ , Duck-Ho Kim ₁ , Se Kwon Kim _{2,

3} , Dong-Kyu Lee ₄ , Se-Hyeok Oh ₅ , Dae-Yun Kim ₆ , Tomoe Nishimura ₁ , Takaya Okuno ₁ , Yasuhiro Futakawa ₇ , Hiroki Yoshikawa ₇ , Arata Tsukamoto ₇ , Yaroslav Tserkovnyak ₂ , Yoichi Shiota ₁ , Takahiro Moriyama ₁ , Sug-Bong Choe ₆ , Kyung-Jin Lee _{4,

5,

8} , Teruo Ono _{1,

9}

Affiliation

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.

中文翻译：

在铁氧体的角动量补偿温度下消失的skyrmion霍尔效应。

在磁场的作用下，导体中带电粒子的流动会从施加力的方向偏转，这会产生普通的霍尔效应。类似地，具有非零拓扑电荷和有限虚拟磁场的运动的Skyrmion表现出Skyrmion霍尔效应，这对诸如Skyrmion赛道记忆之类的应用是有害的。据预测，由于反铁磁天空蛋白的虚拟磁场与净自旋密度成正比，因此天空铁蛋白霍尔效应对于反铁磁性天空蛋白消失。在这里，我们研究钉扎铁磁气泡的电流驱动横向伸长。我们从电流方向和气泡延伸方向之间的角度估算天蝎子霍尔效应。角度，因此在净自旋密度消失的角动量补偿温度下，Skyrmion霍尔效应消失。此外，我们的研究在虚拟磁场和自旋密度之间建立了直接联系。

更新日期：2019-01-23

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