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Perpendicular Magnetic Tunnel Junctions Having CoFeB/CoPt Alloy Layers

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3 Author(s)
Gyung-Min Choi ; Korea Institute of Science and Technology,, Seoul, South Korea ; Byoung-Chul Min ; Kyung-Ho Shin

We have fabricated perpendicular magnetic tunnel junctions consisting of hcp Ru underlayer/hcp CoPt alloy/CoFeB/MgO/CoFeB/CoPt alloy (or Co)/Pt capping layer. By inserting the CoPt alloy (or Co) between the CoFeB and Pt capping layers, it is possible to increase a perpendicular magnetic anisotropy of the top electrode. Using a top electrode of , we have obtained an effective magnetic anisotropy of and a tunnel magnetoresistance (TMR) of 9.4%. The analysis of the crystal structure reveals that the low TMR is a consequence of the fcc (111) texture of CoFeB layers.

Published in:

IEEE Transactions on Magnetics  (Volume:48 ,  Issue: 3 )