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arXiv · 1710.09051

Tuning the Dzyaloshinskii-Moriya Interaction in Pt/Co/MgO heterostructures through MgO thickness

Anni Cao·Xueying Zhang·Bert Koopmans·Shouzhong Peng·Yu Zhang·Zilu Wang·Shaohua Yan·Hongxin Yang·Weisheng Zhao
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Abstract

The interfacial Dzyaloshinskii-Moriya interaction (DMI) in the ferromagnetic/heavy metal ultra-thin film structures , has attracted a lot of attention thanks to its capability to stabilize Neel-type domain walls (DWs) and magnetic skyrmions for the realization of non-volatile memory and logic devices. In this study, we demonstrate that magnetic properties in perpendicularly magnetized Ta/Pt/Co/MgO/Pt heterostructures, such as magnetization and DMI, can be significantly influenced through both the MgO and the Co ultrathin film thickness. By using a field-driven creep regime domain expansion technique, we find that non-monotonic tendencies of DMI field appear when changing the thickness of MgO and the MgO thickness corresponding to the largest DMI field varies as a function of the Co thicknesses. We interpret this efficient control of DMI as subtle changes of both Pt/Co and Co/MgO interfaces, which provide a method to investigate ultra-thin structures design to achieve skyrmion electronics.

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Anni Cao, Xueying Zhang, Bert Koopmans, Shouzhong Peng, Yu Zhang, Zilu Wang, Shaohua Yan, Hongxin Yang, Weisheng Zhao. 2017-10-25. Tuning the Dzyaloshinskii-Moriya Interaction in Pt/Co/MgO heterostructures through MgO thickness. https://arxiv.org/abs/1710.09051

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