Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Room-temperature generation of giant pure spin currents using Co$_2$FeSi
  spin injectors   Generation, manipulation, and detection of a pure spin current, i.e., the
flow of spin angular momentum without a charge current, are prospective
approaches for realizing next-generation spintronic devices with ultra low
electric power consumptions. Conventional ferromagnetic electrodes such as Co
and NiFe have so far been utilized as a spin injector for generating the pure
spin currents in nonmagnetic channels. However, the generation efficiency of
the pure spin currents is extremely low at room temperature, giving rise to a
serious obstacle for device applications. Here, we demonstrate the generation
of giant pure spin currents at room temperature in lateral spin valve devices
with a highly ordered Heusler-compound Co$_2$FeSi spin injector. The generation
efficiency of the pure spin currents for the Co$_2$FeSi spin injectors reaches
approximately one hundred times as large as that for NiFe ones, indicating that
Heusler-compound spin injectors enable us to materialize a high-performance
lateral spin device. The present study is a technological jump in spintronics
and indicates the great potential of ferromagnetic Heusler compounds with half
metallicity for generating pure spin currents.

28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
1
The categories of this paper are: cs