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Effects of annealing on local composition and electrical transport correlations in MgO-based magnetic tunnel junctions
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10.1063/1.2970964
/content/aip/journal/apl/93/10/10.1063/1.2970964
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/10/10.1063/1.2970964
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Figures

Image of FIG. 1.
FIG. 1.

(a) In situ site-specific current-voltage characteristics for as-grown (◆) and annealed at for 1 h (●) CoFe/MgO/CoFe MTJs. In situ TEM images for the (b) as-grown and (c) annealed specimens, corresponding to the curves in (a). The TEM images are small representative sections of a larger image corresponding to an area probed by the 100 nm diameter tip.

Image of FIG. 2.
FIG. 2.

Conductance curves numerically derived from the curves in Fig. 1. The minimum of the as-grown curve (◆) is shifted from 0 V by , while the annealed curve (●) is shifted by only .

Image of FIG. 3.
FIG. 3.

Ex situ HREM images of (a) as-grown and (b) annealed MTJs. Superimposed on each image is a spectrum of the average mass density as a function of position through the barrier calculated from the one-dimensional APT profiles on an absolute scale. The mass contrast in the TEM images agrees with the average mass density calculated from the APT reconstruction.

Image of FIG. 4.
FIG. 4.

One-dimensional concentration profiles obtained from APT reconstructions of (a) as-grown and (b) annealed samples. The interfaces between the CoFe/CoFe oxide/MgO/CoFe are relatively sharp in the as-grown specimen compared to the annealed specimen. Upon annealing, Co and Fe penetrate the MgO layer, Mg diffuses into the CoFe oxide layer, and O diffuses into the bottom CoFe layer.

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/content/aip/journal/apl/93/10/10.1063/1.2970964
2008-09-12
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of annealing on local composition and electrical transport correlations in MgO-based magnetic tunnel junctions
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/10/10.1063/1.2970964
10.1063/1.2970964
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