Dimensional scaling effects on critical current density and magnetization switching in CoFeB-based magnetic tunnel junction

R. Phoomatna, S. Sampan-A-pai, A. Meo, R. W. Chantrell, J. Chureemart, P. Chureemart*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this work, we theoretically investigate the size dependence of the magnetization reversal behavior in CoFeB-MgO-CoFeB magnetic tunnel junctions (MTJs) by employing an atomistic spin model coupled with the spin accumulation model. The former and the latter are used to construct the magnetic structure and to model the spin transport behavior, respectively. The accuracy of the approach is confirmed by investigating the dependence of the magnetic properties on the size of the MTJ. Perpendicular magnetic anisotropy (PMA) is observed for thickness less than 1.3 nm, which is in an excellent agreement with experiment. To investigate the magnetization dynamics induced by spin-polarized current, a charge current is injected into the MTJ structure perpendicular to the stack leading to a spin-transfer torque acting on the magnetization of the CoFeB layer. The results show that the critical current density to reverse the magnetization is lower for PMA-MTJ and in addition for the same injected current density the time required to switch the magnetization is shorter than for an in-plane MTJ. The results can be used as a guideline to optimize the design of high performance MTJs for STT-MRAM applications.

Original languageEnglish
Article number185002
Number of pages8
JournalJournal of Physics D: Applied Physics
Issue number18
Early online date12 Feb 2024
Publication statusPublished - 3 May 2024

Bibliographical note

Funding Information:
P. C. and J. C. gratefully acknowledge the financial support from Thailand Science Research and Innovation (TSRI).

Publisher Copyright:
© 2024 The Author(s). Published by IOP Publishing Ltd.


  • atomistic model
  • magnetic tunnel junction

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