Perpendicular magnetic anisotropy of Cr/CoFeB/MgO modulated by MgO thickness

The dependence of perpendicular magnetic anisotropy (PMA) on the MgO thickness in Cr/CoFeB/MgO/Ta films has been experimentally investigated. A clear PMA is observed in the as-deposited samples with 1.8 nm MgO while no as-deposited PMA is shown in those with 4.0 nm MgO. This may be attributed to the...

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Veröffentlicht in:Journal of physics. D, Applied physics Applied physics, 2024-10, Vol.57 (39), p.395004
Hauptverfasser: Guo, Qixun, Huang, Yiya, Li, Jialiang, Wang, Mengjie, Yang, Nan, Wang, Kun, Cui, Chuanyu, Xu, Xiulan, Teng, Jiao, Zhu, Tao, Yu, Guanghua
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container_issue 39
container_start_page 395004
container_title Journal of physics. D, Applied physics
container_volume 57
creator Guo, Qixun
Huang, Yiya
Li, Jialiang
Wang, Mengjie
Yang, Nan
Wang, Kun
Cui, Chuanyu
Xu, Xiulan
Teng, Jiao
Zhu, Tao
Yu, Guanghua
description The dependence of perpendicular magnetic anisotropy (PMA) on the MgO thickness in Cr/CoFeB/MgO/Ta films has been experimentally investigated. A clear PMA is observed in the as-deposited samples with 1.8 nm MgO while no as-deposited PMA is shown in those with 4.0 nm MgO. This may be attributed to the moderate oxidation degree of CoFeB and larger interfacial anisotropy energy density K i to overcome the volume magnetic anisotropy and demagnetization field. On the contrary, samples with 4.0 nm MgO demonstrate PMA only after annealing, which might be due to the oxygen and boron diffusion during the annealing process. These results would provide a method to optimize the design of CoFeB/MgO structures on 3 d metals for future applications in perpendicular magnetic devices.
doi_str_mv 10.1088/1361-6463/ad5b01
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subjects as-deposited state
interfacial anisotropy energy density
MgO thickness
polarized neutron reflectometry
title Perpendicular magnetic anisotropy of Cr/CoFeB/MgO modulated by MgO thickness
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