论文标题
温度梯度驱动的磁空运动
Temperature gradient-driven magnetic skyrmion motion
论文作者
论文摘要
由于Skyrmions作为信息载体和非常规计算的潜在应用，Skyrmions的静态和动态特性最近受到了越来越多的关注。尽管在理论上和实验上都深入探索了电流驱动的动力学，但温度梯度引起的动力学理论 - 天空 - 卡尔膦元 - 仍处于其发展的早期阶段。在这里，我们通过识别磁性扭矩的作用来向前移动该主题，这是由于磁参数的温度依赖性而引起的。我们的结果表明，Skyrmions在具有界面Dzyaloshinski-Moriya相互作用的单层铁磁体中朝着更高的温度发展，而在多层中，它们转向较低的温度。我们在分析和数值上证明了相反的行为是由于材料参数的不同缩放关系以及多层中不可忽略的磁场梯度造成的。我们还发现，由于天空沿着温度梯度移动，由于厚度依赖性手性的变化，多层的多层依赖于空间依赖性的天堂厅角。
The static and dynamic properties of skyrmions have recently received increased attention due to the potential application of skyrmions as information carriers and for unconventional computing. While the current-driven dynamics has been explored deeply, both theoretically and experimentally, the theory of temperature gradient-induced dynamics - Skyrmion-Caloritronics - is still at its early stages of development. Here, we move the topic forward by identifying the role of entropic torques due to the temperature dependence of magnetic parameters. Our results show that, skyrmions move towards higher temperatures in single-layer ferromagnets with interfacial Dzyaloshinski-Moriya interactions, whereas, in multilayers, they move to lower temperatures. We analytically and numerically demonstrate that the opposite behaviors are due to different scaling relations of the material parameters as well as a non-negligible magnetostatic field gradient in multilayers. We also find a spatially dependent skyrmion Hall angle in multilayers hosting hybrid skyrmions due to variations of the thickness dependent chirality as the skyrmion moves along the temperature gradient.
