Thermally stable voltage-controlled perpendicular magnetic anisotropy in Mo|CoFeB|MgO structures

Xiang Li*, Guoqiang Yu, Hao Wu, P. V. Ong, Kin Wong, Qi Hu, Farbod Ebrahimi, Pramey Upadhyaya, Mustafa Akyol, Nicholas Kioussis, Xiufeng Han, Pedram Khalili Amiri, Kang L. Wang

*Corresponding author for this work

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32 Scopus citations

Abstract

We study voltage-controlled magnetic anisotropy (VCMA) and other magnetic properties in annealed Mo|CoFeB|MgO layered structures. The interfacial perpendicular magnetic anisotropy (PMA) is observed to increase with annealing over the studied temperature range, and a VCMA coefficient of about 40 fJ/V-m is sustained after annealing at temperatures as high as 430?°C. Ab initio electronic structure calculations of interfacial PMA as a function of strain further show that strain relaxation may lead to the increase of interfacial PMA at higher annealing temperatures. Measurements also show that there is no significant VCMA and interfacial PMA dependence on the CoFeB thickness over the studied range, which illustrates the interfacial origin of the anisotropy and its voltage dependence, i.e., the VCMA effect. The high thermal annealing stability of Mo|CoFeB|MgO structures makes them compatible with advanced CMOS back-end-of-line processes, and will be important for integration of magnetoelectric random access memory into on-chip embedded applications.

Original languageEnglish (US)
Article number142403
JournalApplied Physics Letters
Volume107
Issue number14
DOIs
StatePublished - Oct 5 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Li, X., Yu, G., Wu, H., Ong, P. V., Wong, K., Hu, Q., Ebrahimi, F., Upadhyaya, P., Akyol, M., Kioussis, N., Han, X., Khalili Amiri, P., & Wang, K. L. (2015). Thermally stable voltage-controlled perpendicular magnetic anisotropy in Mo|CoFeB|MgO structures. Applied Physics Letters, 107(14), [142403]. https://doi.org/10.1063/1.4932553