Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impact of current paths on measurement of tunneling magnetoresistance
  and spin torque critical current densities in GaMnAs-based magnetic tunnel
  junctions   GaMnAs-based magnetic tunnel junction (MTJ) devices are characterized by
in-plane and perpendicular-toplane magnetotransport at low temperatures.
Perpendicular-to-plane transport reveals the typical tunneling magnetotransport
(TMR) signal. Interestingly, a similar TMR signature is observed in the
in-plane transport signal. Here, low-ohmic shunting of the MTJ by the top
contact results in significant perpendicular-to-plane current paths. This
effect allows the determination of TMR ratios of MTJs based on a simplified
in-plane measurement. However, the same effect can lead to an inaccurate
determination of resistance area products and spin torque critical current
densities from perpendicular-to-plane magnetotransport experiments on MTJ
pillar structures.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int