Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin transfer in ultrathin BiFeO3 film under external electric field   First-principals calculations show that up-spin and down-spin carriers are
accumulating adjacent to opposite surfaces of BiFeO3(BFO) film with applying
external bias. The spin carriers are equal in magnitude and opposite in
direction, and down-spin carriers move to the direction opposing the external
electric field while up-spin ones along the field direction. This novel spin
transfer properties make BFO film an intriguing candidate for application in
spin capacitor and BFO-based multiferroic field-effect device.

23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg