Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic tunnel junctions with impurities   The influence of impurities, embedded into the isolating spacer (I) between
two ferromagnetic electrodes (F), on the I-V curve and tunnel magnetoresistance
(TMR), is theoretically investigated. It is shown, that the current and TMR are
strongly enhanced in the vicinity of the impurity under the condition that the
energy of the electron's bound state on the impurity is close to the Fermi
energy. If the position of the impurity inside the barrier is asymmetric, e.g.
closer to the one of the interfaces F/I the I-V curve exhibits quasidiode
behavior.

13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th