Thermal stability of Ir-MnCo-Fe-BAl-OCo-Fe-B tunnel junctions

Li, F. F., Sharif, R., Jiang, L. X., Zhang, X. Q., Han, X. F., Wang, Y. and Zhang, Z. (2005) Thermal stability of Ir-MnCo-Fe-BAl-OCo-Fe-B tunnel junctions. Journal of Applied Physics, 98 11: 113710.1-113710.4. doi:10.1063/1.2137888

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Author Li, F. F.
Sharif, R.
Jiang, L. X.
Zhang, X. Q.
Han, X. F.
Wang, Y.
Zhang, Z.
Title Thermal stability of Ir-MnCo-Fe-BAl-OCo-Fe-B tunnel junctions
Journal name Journal of Applied Physics   Check publisher's open access policy
ISSN 0021-8979
Publication date 2005-12-01
Year available 2005
Sub-type Article (original research)
DOI 10.1063/1.2137888
Open Access Status File (Publisher version)
Volume 98
Issue 11
Start page 113710.1
End page 113710.4
Total pages 4
Place of publication College Park, MD, United States
Publisher American Institute of Physics
Language eng
Formatted abstract
The thermal stability of magnetic tunnel junctions with structures of Ta(5)/Cu(30)/Ta(5)/Ni79Fe21(5)/Ir22Mn78(12)/Co62Fe20B18(4)/Al(0.8)-oxide/Co62Fe20B18(4)/Cu(30)/Ta(5) (thicknesses unit in nanometers) has been investigated. The tunnel magnetoresistance (TMR) shows a large increase up to 54.4% after annealing at 265 °C due to the improved characteristic properties of the barrier and the interface between the barrier and the ferromagnetic electrodes. The TMR was observed to decrease drastically above the annealing temperature of 310 °C accompanied by a notable increase of junction resistance and coercivity of the free layer. The amorphous Co62Fe20B18 layers seem to behave as a barrier of diffusion, preventing the migration of Mn or Cu atoms into the interface between the barrier and the ferromagnetic layers. This may cause the drastic decrease of TMR due to the deterioration of the barrier and its interface with Co62Fe20B18 layers. The observed crystallization in the amorphous Co62Fe20B18 layers is considered to contribute to the increase in coercivity of the free layer.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article number 113710

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
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