Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin polarized current and Andreev transmission in planar
  superconducting-ferromagnetic Nb-Ni junctions   We have measured and modeled, using three different approaches, the tunneling
current in a Nb/NbxOy/Ni planar tunnel junction. The experimental data could be
fitted and the correct current polarization could be extracted using a simple
quasiclassical model, even in the absence of an applied magnetic field. We also
discuss the microscopic structure of the barrier.

6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int