TITLE

Enhancement of the thermal stability of magnetic tunnel junctions employing artificial ferrimagnets

AUTHOR(S)
Dimopoulos, T.; Tiusan, C.; Costa, V. da; da Costa, V.; Ounadjela, K.; van den Berg, H. A. M.; van den Berg, H.A.M.
PUB. DATE
November 2000
SOURCE
Applied Physics Letters;11/27/2000, Vol. 77 Issue 22
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have fabricated magnetic tunnel junctions that use Co/Ru/Co and Co/Ru/Co[sub 50]Fe[sub 50] artificial ferrimagnet (AFi) systems as hard magnetic electrodes and AlO[sub x] as tunnel barrier. The thermal behavior of the two AFis, incorporated in tunnel junctions, presents dramatic differences, the most remarkable being the much greater thermal stability of the Co/Ru/CoFe system. This stems from the improvement of the interfaces the CoFe alloy forms with its adjacent Ru and AlO[sub x] layers. After successive annealing steps up to 400 °C, junctions incorporating the Co/Ru/CoFe system still present a significant tunnel magnetoresistance signal of nearly 20%, and most importantly, an almost intact magnetic rigidity of the hard magnetic system, being very promising for spin-electronic devices. © 2000 American Institute of Physics.
ACCESSION #
4415059

 

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