Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-polarized currents generated by magnetic Fe atomic chains   Fe-based devices are widely used in spintronics because of high
spin-polarization and magnetism. In this work, free-standing Fe atomic chains
were proposed to be used as the thinnest wires to generate spin-polarized
currents due to the spin-polarized energy bands. By ab initio calculations, the
zigzag structure was found more stable than the wide-angle zigzag structure and
has higher ratio of spin-up and spin-down currents. By our theoretical
prediction, Fe atomic chains have sufficiently long thermal lifetime only at
T<=150 K, while C atomic chains are very stable even at T=1000 K. This result
means that the spintronic devices based on Fe chains could only work at low
temperature. A system constructed by a short Fe chain sandwiched between two
graphene electrodes was proposed as a spin-polarized current generator, while a
C chain does not have such property. The present work may be instructive and
meaningful to further practical applications based on recent technical
development on the preparation of metal atomic chains [Proc. Natl. Acad. Sci.
U.S.A. 107, 9055 (2010)].

8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: stat