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arXiv 2208.04492cond-mat.mtrl-sci
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生长依赖的层间手性交换与无场切换

Growth-dependent Interlayer Chiral Exchange and Field-free Switching

Yu-Hao Huang, Chao-Chung Huang, Wei-Bang Liao, Tian-Yue Chen, Chi-Feng Pai

AI总结:

本文报道了通过Pt层介导的CoFeB/Co两层间DMI,其有效场达37 Oe,并利用该手性场实现了垂直磁化Co层的确定性无场电流驱动切换,展示了层间DMI在自旋存储应用中的潜力。

摘要:

界面Dzyaloshinskii-Moriya相互作用(DMI)长期以来在普通金属/铁磁多层膜中被观察到,使得在手性畴壁、斯格明子以及其他二维反对称自旋纹理的形成成为可能,这些结构被限制在单个铁磁层内,而最近关于层间DMI的研究揭示了在两个分离层之间实现新型手性三维自旋纹理的新途径。在此,我们报道了通过Pt层介导的两个正交磁化铁磁层(CoFeB/Co)之间的层间DMI,并通过面内磁场下的不对称磁滞回线确认了所观察到的有效场(高达37 Oe)的手性本质。我们强调了生长诱导的面内对称性破缺的重要性,通过样品的楔形沉积产生了可观的层间DMI和一个普遍的特征向量。我们进一步利用仅来自层间DMI的有效场,在垂直磁化的Co层中实现了确定性的电流驱动磁化切换。这些结果证明了层间DMI在自旋存储器应用中促进确定性无场切换的潜力。

英文摘要:

Interfacial Dzyaloshinskii-Moriya interaction (DMI) has long been observed in normal metal/ferromagnetic multilayers, enabling the formation of chiral domain walls, skyrmions and other 2D antisymmetric spin textures confined within a single ferromagnetic layer, while more recent works on interlayer DMI reveal new pathways in realizing novel chiral 3D spin textures between two separate layers.Here, we report on interlayer DMI between two orthogonally magnetized ferromagnetic layers (CoFeB/Co) mediated by a Pt layer, and confirm the chiral nature of the observed effective field of up to 37 Oe through asymmetric hysteresis loops under in-plane field.We highlight the importance of growth-induced in-plane symmetry breaking, resulting in a sizable interlayer DMI and a universal characteristic vector through wedge deposition of the samples.We further perform deterministic current-driven magnetization switching in the perpendicularly magnetized Co layer utilizing solely the effective field from the interlayer DMI.These results demonstrate the potential of interlayer DMI in facilitating deterministic field-free switching in spin memory applications.

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