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• W4308045336 abstract "Abstract Magnetic tunnel junction (MTJ) with magnesium oxide (MgO) tunnel barrier is the core element of spin transfer torque-based magnetic random access memory. For the application in the space environment, the total ionizing dose radiation effects on MTJs need to be evaluated. In this work, the MTJs were exposed to X-ray radiation with different doses of up to 10 Mrad(Si). Measurements of current induced magnetization switching (CIMS) behavior of these MTJs were performed before and after radiation. The results show negligible changes in the tunneling magnetoresistance and current switching properties after 8 Mrad(Si) X-ray radiation. However, with a total dose of 9 Mrad(Si), a significant reduction in junction resistance of a fairly large number of MTJs was observed, which showed characteristics of MTJ breakdown. Moreover, in this study, all experimental MTJs became functionally disabled due to MgO breakdown under 10 Mrad(Si) X-ray radiation. The CoFeB/MgO/CoFeB interface microstructure was observed using X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy (HRTEM). Interfacial structural results indicate that the MgO degradation and breakdown behavior caused by X-ray ionizing radiation can give rise to radiation-induced oxygen vacancies across the tunnel barrier oxide layer." @default.
• W4308045336 created "2022-11-07" @default.
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• W4308045336 date "2022-11-03" @default.
• W4308045336 modified "2023-10-03" @default.
• W4308045336 title "High-dose X-ray radiation induced MgO degradation and breakdown in spin transfer torque magnetic tunnel junctions" @default.
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• W4308045336 doi "https://doi.org/10.1038/s41598-022-19342-x" @default.
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• W4308045336 hasPublicationYear "2022" @default.
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