Magnetic skyrmion tubes and bobbers are two types of different nanoscale spin configurations that can coexist in nanostructures of chiral magnets. They are then proposed to be utilized as binary bits to build racetrack memory devices. The ability to manipulate the two magnetic objects controllably by current in nanostructures is the prerequisite to realize the device. Here, we demonstrate by numerical simulations that a magnetic bobber and a skyrmion tube can be transformed to each other using spin-polarized current in nanostripes with stepped shape. We also show such stepped nanostructures can be readily applied as the write head for the skyrmion-bobber-based racetrack memory.

磁性天rm子管和浮子是两种类型的不同纳米级自旋结构，可以共存于手性磁体的纳米结构中。然后提出将它们用作二进制位以构建赛道存储设备。通过纳米结构中的电流可控地操纵两个磁性物体的能力是实现该装置的前提。在这里，我们通过数值模拟证明，可以使用具有阶梯形状的纳米带中的自旋极化电流将磁浮子和天体离子管彼此转换。我们还表明，这种阶梯状的纳米结构可以很容易地用作基于skyrmion-bobber的赛道存储器的写入头。