The magnetic skyrmionium can be seen as a coalition of two magnetic skyrmions with opposite topological charges and has potential applications in next-generation spintronic devices. Here, we report the current-driven dynamics of a skyrmionium in a ferromagnetic nanotrack with the voltage-controlled magnetic anisotropy. The pinning and depinning of a skyrmionium controlled by the voltage gate are investigated. The current-driven skyrmionium can be used to mimic the skyrmionium diode effect in the nanotrack with a voltage gate. We have further studied the skyrmionium dynamics in the nanotrack driven by a magnetic anisotropy gradient in the absence of spin current. The performance of a single wedge-shaped voltage gate at different temperatures is studied. Our results may provide useful guidelines for the design of voltage-controlled and skyrmionium-based spintronic devices.

中文翻译：

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具有磁各向异性电压门控的磁性skyrmionium二极管

磁性skyrmionium 可以被视为具有相反拓扑电荷的两个磁性skyrmionion 的联盟，并且在下一代自旋电子器件中具有潜在的应用。在这里，我们报告了具有电压控制磁各向异性的铁磁纳米轨道中skyrmionium 的电流驱动动力学。研究了由电压门控制的skyrmionium的钉扎和脱钉。电流驱动的 Skyrmionium 可用于模拟具有电压门的纳米轨道中的 Skyrmionium 二极管效应。我们进一步研究了在没有自旋电流的情况下由磁各向异性梯度驱动的纳米轨道中的 Skyrmionium 动力学。研究了单个楔形电压门在不同温度下的性能。