Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnon and phonon assisted tunneling in a high-magnetoresistance tunnel
  junction using Co$_{75}$Fe$_{25}$ ferromagnetic electrodes   Magnetoelectric properties of the spin-valve-type tunnel junction of Ta(5\
nm)/Ni$_{79}$Fe$_{21}$ (25 nm)/Ir$_{22}$Mn$_{78}$ (10 nm)/Co$_{75}$Fe$_{25}$ (4
nm)/Al (0.8 nm)-oxide/Co$_{75}$Fe$_{25}$ (4 nm)/Ni$_{79}$Fe$_{21}$ (20 nm)/Ta
(5 nm) are investigated both experimentally and theoretically. It is shown that
both magnon and phonon excitations contribute to the tunneling process.
Moreover, we show that there are two branches of magnon with spin $S=1/2$ and
3/2 respectively. The theoretical results are in good agreement with the
experimental data.

3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio