Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of the Hall-bar geometry on harmonic Hall voltage measurements
  of spin-orbit torques   Harmonic Hall voltage measurements are a wide-spread quantitative technique
for the measurement of spin-orbit induced effective fields in heavy-metal /
ferromagnet heterostructures. In the vicinity of the voltage pickup lines in
the Hall bar, the current is inhomogeneous, which leads to a hitherto not
quantified reduction of the effective fields and derived quantities, such as
the spin Hall angle or the spin Hall conductivity. Here we present a thorough
analysis of the influence of the aspect ratio of the voltage pickup lines to
current channel widths on the apparent spin Hall angle. Experiments were
performed with Hall bars with a broad range of aspect ratios and a substantial
reduction of the apparent spin Hall angle is already seen in Hall crosses with
an aspect ratio of 1:1. Our experimental results are confirmed by
finite-element simulations of the current flow.

22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an