Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Circuit model for spin-bottleneck resistance in magnetic-tunnel-junction
  devices   Spin-bottlenecks are created in magnetic-tunnel-junction devices by spatial
inhomogeneity in the relative resistances for up and down spins. We propose a
simple electrical circuit model for these devices which incorporates
spin-bottleneck effects and can be used to calculate their overall resistance
and magnetoresistance. The model permits a simple understanding of the
dependence of device magnetoresistance on spin diffusion lengths, tunneling
magnetoresistance, and majority and minority spin resistivities in the
ferromagnetic electrodes. The circuit model is in a good quantitative agreement
with detailed transport calculations.

2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph