Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-range spin current driven by superconducting phase difference in a
  Josephson junction with double layer ferromagnets   We theoretically study spin current through ferromagnet (F) in a Josephson
junction composed of s-wave superconductors and two layers of ferromagnets.
Using quasiclassical theory, we show that the long-range spin current can be
driven by the superconducting phase difference without voltage drop. The origin
of this spin current is due to spin-triplet Cooper pairs (STCs) formed by
electrons of equal-spin, which are induced by proximity effect inside the F. We
find that the spin current carried by the STCs exhibits long-range propagation
in the F even where the Josephson charge current is practically zero. We also
show that this spin current persists over a remarkably longer distance than the
ordinary spin current carried by spin polarized conduction electrons in the F.
Our results thus indicate the promising potential of Josephson junctions based
on multilayer ferromagnets for spintronics applications with long-range
propagating spin current.

15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg