Element-specific spin and orbital moments and perpendicular magnetic anisotropy in Ta/CoFeB/MgO structures

Yu Yan, Xianyang Lu, Bo Liu, Xiaoqian Zhang, Xiangyu Zheng, Hao Meng, Wenqing Liu, Junlin Wang, Iain G. Will, Jing Wu, Ping Kwan Johnny Wong, Jianwang Cai, Jun Du, Rong Zhang, Yongbing Xu*

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    1 Citation (Scopus)

    Abstract

    Perpendicular magnetic anisotropy (PMA) in the Ta/CoFeB/MgO system has been studied using x-ray magnetic circular dichroism and vibrating sample magnetometry. The ratios of the orbital to spin magnetic moments of Co atoms in the Ta/CoFeB/MgO structures with PMA have been found to be enhanced by 100%, compared with the Ta/CoFeB/Ta structure without PMA. The orbital moments of Co are as large as 0.30 μ B, more than half of their spin moments in the perpendicularly magnetized Ta/CoFeB/MgO structures. The results indicate that the PMA observed in the CoFeB/MgO structures is related to the increased spin-orbital coupling of the Co atoms. This work offers experimental evidence of the correlation between PMA and the element-specific spin and orbital moments in the Ta/CoFeB/MgO systems.

    Original languageEnglish
    Article number063903
    JournalJournal of Applied Physics
    Volume127
    Issue number6
    DOIs
    Publication statusPublished - 14 Feb 2020

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