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Current‐Induced Skyrmion Generation through Morphological Thermal Transitions in Chiral Ferromagnetic Heterostructures
Advanced Materials ( IF 29.4 ) Pub Date : 2018-10-04 , DOI: 10.1002/adma.201805461
Ivan Lemesh 1 , Kai Litzius 2, 3, 4 , Marie Böttcher 2 , Pedram Bassirian 2 , Nico Kerber 2 , Daniel Heinze 2 , Jakub Zázvorka 2 , Felix Büttner 1 , Lucas Caretta 1 , Maxwell Mann 1 , Markus Weigand 4 , Simone Finizio 5 , Jörg Raabe 5 , Mi‐Young Im 6, 7, 8 , Hermann Stoll 4 , Gisela Schütz 4 , Bertrand Dupé 2 , Mathias Kläui 2, 3 , Geoffrey S. D. Beach 1
Affiliation  

Magnetic skyrmions promise breakthroughs in future memory and computing devices due to their inherent stability and small size. Their creation and current driven motion have been recently observed at room temperature, but the key mechanisms of their formation are not yet well‐understood. Here it is shown that in heavy metal/ferromagnet heterostructures, pulsed currents can drive morphological transitions between labyrinth‐like, stripe‐like, and skyrmionic states. Using high‐resolution X‐ray microscopy, the spin texture evolution with temperature and magnetic field is imaged and it is demonstrated that with transient Joule heating, topological charges can be injected into the system, driving it across the stripe‐skyrmion boundary. The observations are explained through atomistic spin dynamic and micromagnetic simulations that reveal a crossover to a global skyrmionic ground state above a threshold magnetic field, which is found to decrease with increasing temperature. It is demonstrated how by tuning the phase stability, one can reliably generate skyrmions by short current pulses and stabilize them at zero field, providing new means to create and manipulate spin textures in engineered chiral ferromagnets.

中文翻译:

通过手性铁磁异质结构的形态热跃迁产生电流诱导的Skyrmion。

磁性天体由于其固有的稳定性和小巧的尺寸,有望在未来的存储器和计算设备中取得突破。最近在室温下观察到了它们的产生和电流驱动运动,但是其形成的关键机制尚未得到很好的理解。此处显示出,在重金属/铁磁体异质结构中,脉冲电流可以驱动迷宫状,条状和天空离子状态之间的形态学转变。使用高分辨率的X射线显微镜,可以观察到自旋纹理随温度和磁场的变化,并证明了通过瞬时焦耳加热,可以将拓扑电荷注入到系统中,从而将其驱动跨过条状角膜边界。通过原子自旋动力学和微磁模拟解释了这些观察结果,这些模拟揭示了在阈值磁场之上与全局天体离子基态的交叉,发现该阈值磁场随温度升高而减小。演示了如何通过调节相位稳定性来通过短电流脉冲可靠地产生sky离子并使它们稳定在零场,从而为在工程手性铁磁体中创建和操纵自旋织构提供了新的手段。
更新日期:2018-10-04
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