We report deterministic operations on single dipolar skyrmions confined in nanostructured cuboids by using in-plane currents. We achieve highly reversible writing and deleting of skyrmions in a simple cuboid without any artificial defects or pinning sites. The current-induced creation of skyrmions is well-understood through the spin-transfer torque acting on surface spin twists of the spontaneous 3D ferromagnetic state, caused by the magnetic dipole–dipole interaction of the uniaxial Fe₃Sn₂ magnet with a low-quality factor. Current-induced deletions of skyrmions result from the combined effects of magnetic hysteresis and Joule thermal heating. Our results are replicated consistently through 3D micromagnetic simulations. Our approach offers a viable method for achieving reliable single-bit operations in skyrmionic devices for applications such as random-access memories.

中文翻译：

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通过曲面自旋扭曲创建和删除单个偶极斯格明子


我们报道了通过使用面内电流对限制在纳米结构长方体中的单个偶极斯格明子进行确定性操作。我们在一个简单的长方体中实现了高度可逆的斯格明子写入和删除，没有任何人工缺陷或固定位点。通过作用在自发 3D 铁磁态表面自旋扭曲上的自旋转移扭矩，可以很好地理解电流感应产生的斯格明子，这是由具有低品质因数的单轴 Fe₃Sn₂ 磁体的磁偶极子-偶极相互作用引起的。电流诱导的斯格明子缺失是磁滞和焦耳热的综合作用的结果。我们的结果通过 3D 微磁模拟一致地复制。我们的方法提供了一种可行的方法，可以在斯格尔敏子器件中实现可靠的单比特操作，用于随机存取存储器等应用。