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

doi:10.1063/1.5129489

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 journal › Article › Academic › peer-review

3 Citations (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 language	English
Article number	063903
Journal	Journal of Applied Physics
Volume	127
Issue number	6
DOIs	https://doi.org/10.1063/1.5129489
Publication status	Published - 14 Feb 2020

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10.1063/1.5129489

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

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.",

keywords = "n/a OA procedure",

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

note = "Funding Information: This work was supported in part by the National Key Research and Development Program of China (No. 2016YFA0300803), the National Natural Science Foundation of China (NNSFC) (Nos. 61427812, 11774160, and 51871236), Jiangsu Shuangchuang Programme, and UK EPSRC (No. EP/S010246/1). Diamond Light Source is acknowledged to I10 under Proposal No. 16538. Publisher Copyright: {\textcopyright} 2020 Author(s).",

year = "2020",

month = feb,

day = "14",

doi = "10.1063/1.5129489",

language = "English",

volume = "127",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Element-specific spin and orbital moments and perpendicular magnetic anisotropy in Ta/CoFeB/MgO structures

AU - Yan, Yu

AU - Lu, Xianyang

AU - Liu, Bo

AU - Zhang, Xiaoqian

AU - Zheng, Xiangyu

AU - Meng, Hao

AU - Liu, Wenqing

AU - Wang, Junlin

AU - Will, Iain G.

AU - Wu, Jing

AU - Wong, Ping Kwan Johnny

AU - Cai, Jianwang

AU - Du, Jun

AU - Zhang, Rong

AU - Xu, Yongbing

N1 - Funding Information: This work was supported in part by the National Key Research and Development Program of China (No. 2016YFA0300803), the National Natural Science Foundation of China (NNSFC) (Nos. 61427812, 11774160, and 51871236), Jiangsu Shuangchuang Programme, and UK EPSRC (No. EP/S010246/1). Diamond Light Source is acknowledged to I10 under Proposal No. 16538. Publisher Copyright: © 2020 Author(s).

PY - 2020/2/14

Y1 - 2020/2/14

N2 - 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.

AB - 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.

KW - n/a OA procedure

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VL - 127

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

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

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