DocumentCode :
3560374
Title :
Effects of MgO Barrier Thickness on Magnetic Anisotropy Energy Constant in Perpendicular Magnetic Tunnel Junctions of (Co/Pd) 
/MgO/(Co/Pt) <
Author :
Lee, Ching-Ming ; Lee, Jia-Mou ; Ye, Lin-Xiu ; Wang, Sheng-Yuan ; Wang, Yi-Rung ; Wu, Te-Ho
Author_Institution :
Taiwan SPIN Res. Center, Nat. Yunlin Univ. of Sci. & Technol., Douliou
Volume :
44
Issue :
11
fYear :
2008
Firstpage :
2558
Lastpage :
2561
Abstract :
In this study, we report experimental results on perpendicular magnetic tunnel junctions composed of the binary multilayer Co/Pt and Co/Pd with various MgO barrier thicknesses. The coercivities of both Co/Pt and Co/Pd layers varied substantially with the MgO thickness. Very interestingly, the perpendicular anisotropy constant Ku of the Co/Pt multilayer measured by the extraordinary Hall effect oscillated with the MgO thickness, and the period of this oscillation was about 0.3 nm. Furthermore, both the Ku value and the oscillation amplitude decreased after annealing at 150deg C and 200deg C, which suggest that the oscillation may result from the film morphology.
Keywords :
Hall effect; annealing; cobalt; coercive force; magnesium compounds; magnetic anisotropy; magnetic multilayers; magnetic tunnelling; magnetoelectric effects; palladium; platinum; (Co-Pd)n-MgO-(Co-Pt)n; Hall effect; annealing; binary magnetic multilayers; coercivity; film morphology; oscillation; perpendicular magnetic anisotropy; perpendicular magnetic tunnel junctions; temperature 150 C; temperature 200 C; Extraordinary Hall effect (EHE); perpendicular anisotropy constant; perpendicular magnetic tunnel junctions (pMTJs);
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2008.2002594
Filename :
4717738
Link To Document :
