Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonvolatile bipolar resistive switching in Au/BiFeO3/Pt   Nonvolatile bipolar resistive switching has been observed in an Au/BiFeO3/Pt
structure, where a Schottky contact and a quasi-Ohmic contact were formed at
the Au/BiFeO3 and BiFeO3/Pt interface, respectively. By changing the polarity
of the external voltage, the Au/BiFeO3/Pt is switched between two stable
resistance states without an electroforming process. The resistance ratio is
larger than two orders of magnitude. The resistive switching is understood by
the electric field - induced carriers trapping and detrapping, which changes
the depletion layer thickness at the Au/BiFeO3 interface.

21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph