Annealing temperature window for tunneling magnetoresistance and spin torque switching in CoFeB/MgO/CoFeB perpendicular magnetic tunnel junctions

H. Meng, R. Sbiaa, C. C. Wang, S. Y H Lua, M. A K Akhtar

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Annealing temperature (Ta) and free layer thickness dependencies of magnetic properties and spin-transfer torque switching were investigated in CoFeB-MgO based magnetic tunnel junctions with perpendicular magnetic anisotropy (PMA). Annealing process was found to be critical to buildup PMA. As T a increases, switching field of free layer and reference layer is enhanced first then drops, corresponding to the improvement and collapse of PMA in both layers. However, it should be noted that PMA of free layer and the tunneling magnetoresistive (TMR) are maximized at different Ta zones. Spin transfer torque study pointed out that switching current density (J c) depends on the combined effects from PMA, spin polarization, and saturation magnetization, which all depend on Ta values. Thickness dependence study revealed that Jc relies on the competing results of the thickness and PMA. The lowest critical switching current density achieved is 2.1 MA/cm2, accompanied with a TMR around 52 at room temperature.

Original languageEnglish
Article number103915
JournalJournal of Applied Physics
Volume110
Issue number10
DOIs
Publication statusPublished - Nov 15 2011

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tunnel junctions
torque
anisotropy
annealing
temperature
current density
magnetic properties
saturation
magnetization
room temperature
polarization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Annealing temperature window for tunneling magnetoresistance and spin torque switching in CoFeB/MgO/CoFeB perpendicular magnetic tunnel junctions. / Meng, H.; Sbiaa, R.; Wang, C. C.; Lua, S. Y H; Akhtar, M. A K.

In: Journal of Applied Physics, Vol. 110, No. 10, 103915, 15.11.2011.

Research output: Contribution to journalArticle

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