Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pt/Ti/Al2O3/Al tunnel junctions showing electroforming-free bipolar
  resistive switching behavior   We investigated electroforming-free bipolar resistive switching behavior in
Pt/Ti/Al2O3/Al tunnel junctions where the Al2O3 tunnel barrier was naturally
formed on Al in air. Various compliance current values for the junction's set
switching successfully lead to various resistance values in its low resistance
state, suggesting the possibility for multi-level-operation. A mechanism for
the bipolar switching is qualitatively discussed in terms of the modulation of
the tunnel barrier by the reactive Ti layer on top of the barrier.

21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc