Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular magnetic anisotropy.,Nature Materials

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Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular magnetic anisotropy.
Nature Materials ( IF 37.2 ) Pub Date : 2019-08-12 , DOI: 10.1038/s41563-019-0454-9
Wenbo Wang ₁ , Matthew W Daniels _{2,

3} , Zhaoliang Liao _{4,

5} , Yifan Zhao ₆ , Jun Wang ₅ , Gertjan Koster ₅ , Guus Rijnders ₅ , Cui-Zu Chang ₆ , Di Xiao ₃ , Weida Wu ₁

Affiliation

Non-coplanar spin textures with scalar spin chirality can generate an effective magnetic field that deflects the motion of charge carriers, resulting in a topological Hall effect (THE)1-3. However, spin chirality fluctuations in two-dimensional ferromagnets with perpendicular magnetic anisotropy have not been considered so far. Here, we report evidence of spin chirality fluctuations by probing the THE above the Curie temperature in two different ferromagnetic ultra-thin films, SrRuO3 and V-doped Sb2Te3. The temperature, magnetic field, thickness and carrier-type dependence of the THE signal, along with Monte Carlo simulations, suggest that spin chirality fluctuations are a common phenomenon in two-dimensional ferromagnets with perpendicular magnetic anisotropy. Our results open a path for exploring spin chirality with topological Hall transport in two-dimensional magnets and beyond4-7.

中文翻译：

具有垂直磁各向异性的二维铁磁体的自旋手征性涨落。

具有标量自旋手性的非共面自旋纹理可以生成有效的磁场，该磁场会偏转电荷载流子的运动，从而导致拓扑霍尔效应（THE）1-3。但是，至今尚未考虑具有垂直磁各向异性的二维铁磁体的自旋手性波动。在这里，我们通过探测两种不同铁磁超薄膜SrRuO3和V掺杂Sb2Te3的居里温度之上的THE来报告自旋手性波动的证据。THE信号的温度，磁场，厚度和载流子类型相关性以及蒙特卡罗模拟表明，自旋手征性波动是具有垂直磁各向异性的二维铁磁体中的常见现象。

更新日期：2019-08-12

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