Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How to calculate the degree of spin polarization in ferromagnets?   Different ways to define and to calculate the degree of spin polarization in
a ferromagnet are discussed, particularly with respect to spin-polarized
tunneling and Andreev reflection at the boundary between a superconductor and
ferromagnet. As an example, the degrees of spin polarization for different
experiments in Fe and Ni are calculated in the framework of the local spin
density approximation (LSDA) and used to illustrate the differences between
various definitions of spin polarization.

19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn