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Enhanced Reliability of Top-pinned Perpendicular Magnetic Tunnel Junction by Post-oxidation of Sputtered MgO Barrier

Published online by Cambridge University Press:  30 January 2017

Chikako Yoshida ,
Hideyuki Noshiro ,
Yuichi Yamazaki  and
Toshihiro Sugii
Chikako Yoshida*
Affiliation:
Fujitsu Limited, 10-1 Morinosato-Wakamiya, Atsugi, 243-0197, Japan
Hideyuki Noshiro
Affiliation:
Fujitsu Limited, 10-1 Morinosato-Wakamiya, Atsugi, 243-0197, Japan
Yuichi Yamazaki
Affiliation:
Fujitsu Limited, 10-1 Morinosato-Wakamiya, Atsugi, 243-0197, Japan
Toshihiro Sugii
Affiliation:
Fujitsu Limited, 10-1 Morinosato-Wakamiya, Atsugi, 243-0197, Japan
*
*(Email: [email protected])
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Abstract

We proposed an MgO barrier which is fabricated by combination of rf-sputter deposition of MgO film and subsequent in-situ post oxidation (PO). We found that the perpendicular magnetic anisotropy (PMA) of the CoFeB layer formed on this MgO barrier with PO was improved. We also found that a short error rate reduced drastically and a magnetoresistance (MR) ratio increased about 20% for the magnetic tunnel junction (MTJ) with this MgO barrier with PO. In addition, we showed that this MgO barrier with PO has long endurance life compared with conventional sputtered MgO barriers, and has a potential to operate over 1016 write cycles.

Furthermore, we have observed that the PO could suppress the Fe diffusion into the MgO barrier and form Fe-O bonding at MgO/CoFeB interface using electron energy-loss spectroscopy (EELS). The obtained results might be involved to the improvement of PMA and MTJ characteristics.

Keywords

barrier layeroxidationmemory
Type
Articles
Information
MRS Advances , Volume 2 , Issue 4: Electronics, Magnetics and Photonics , 2017 , pp. 259 - 264
Copyright
Copyright © Materials Research Society 2017 

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References

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