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EELS Analysis of Oxygen Scavenging Effect in a Resistive Switching Structure of Pt/Ta/SrTiO3/Pt

Published online by Cambridge University Press:  10 January 2018

Atsushi Tsurumaki-Fukuchi ,
Ryosuke Nakagawa ,
Masashi Arita  and
Yasuo Takahashi
Atsushi Tsurumaki-Fukuchi*
Affiliation:
Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido060-0814, Japan
Ryosuke Nakagawa
Affiliation:
Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido060-0814, Japan
Masashi Arita
Affiliation:
Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido060-0814, Japan
Yasuo Takahashi
Affiliation:
Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido060-0814, Japan
*
†(Email: [email protected])
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Abstract

A complex mechanism of interfacial oxygen scavenging is revealed by electron energy-loss spectroscopy (EELS) for a resistive switching oxide of SrTiO3 with a scavenging layer of Ta. When Ta thin layer is inserted at one of the interfaces of Pt/SrTiO3/Pt structure, a large reduction of electrical resistance is induced for the structure, and oxygen defects are introduced at the interfacial part of SrTiO3. In the resistance decrease by voltage applications, simultaneous occurrence of oxidation and reduction of Ta scavenging layer is shown by EELS analyses from the low-loss spectra. The EELS and scanning transmission electron microscopy observations demonstrate that oxygen scavenging by Ta layer is an interfacial phenomenon where the redox reactions occur at the whole part of the interface. In addition, Pt electrode of the structure, which is chemically inert for oxidation, is revealed to have significant effects in the scavenging processes.

Keywords

oxidationmemoryelectron energy loss spectroscopy (EELS)
Type
Articles
Information
MRS Advances , Volume 3 , Issue 33: Electronics, Magnetics and Photonics , 2018 , pp. 1925 - 1930
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Copyright
Copyright © Materials Research Society 2018 

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Footnotes

*

This article has been updated since original publication. For details see doi: 10.1557/adv.2018.129.

References

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