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

TY - JOUR

T1 - Dimensional scaling effects on critical current density and magnetization switching in CoFeB-based magnetic tunnel junction

AU - Phoomatna, R.

AU - Sampan-A-pai, S.

AU - Meo, A.

AU - Chantrell, R. W.

AU - Chureemart, J.

AU - Chureemart, P.

N1 - 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.

PY - 2024/5/3

Y1 - 2024/5/3

N2 - 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.

AB - 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.

KW - atomistic model

KW - magnetic tunnel junction

KW - STT-MRAM

UR - http://www.scopus.com/inward/record.url?scp=85184852057&partnerID=8YFLogxK

U2 - 10.1088/1361-6463/ad2477

DO - 10.1088/1361-6463/ad2477

M3 - Article

AN - SCOPUS:85184852057

SN - 0022-3727

VL - 57

JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

IS - 18

M1 - 185002

ER -