Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large enhancement in the generation efficiency of pure spin currents in
  Ge using Heusler-compound Co_2FeSi electrodes   We show nonlocal spin transport in n-Ge based lateral spin-valve devices with
highly ordered Co_2FeSi/n^+-Ge Schottky tunnel contacts. Clear spin-valve
signals and Hanle-effect curves are demonstrated at low temperatures,
indicating generation, manipulation, and detection of pure spin currents in
n-Ge. The obtained spin generation efficiency of ~ 0.12 is about two orders of
magnitude larger than that for a device with Fe/MgO tunnel-barrier contacts
reported previously. Taking the spin related behavior with temperature
evolution into account, we infer that it is necessary to simultaneously
demonstrate the high spin generation efficiency and improve the quality of the
transport channel for achieving Ge based spintronic devices.

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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
2
The categories of this paper are: math
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The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: eess
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph