Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Current-nonlinear Hall effect and spin-orbit torque magnetization
  switching in a magnetic topological insulator   Precise estimation of spin Hall angle as well as successful maximization of
spin-orbit torque (SOT) form a basis of electronic control of magnetic
properties with spintronic functionality. Until now, current-nonlinear Hall
effect, or second harmonic Hall voltage has been utilized as one of the methods
for estimating spin Hall angle, which is attributed to the magnetization
oscillation by SOT. Here, we argue the second harmonic Hall voltage in
magnetic/nonmagnetic topological insulator (TI) heterostructures,
Cr$_x$(Bi$_{1-y}$Sb$_y$)$_{2-x}$Te$_3$/(Bi$_{1-y}$Sb$_y$)$_2$Te$_3$. From the
angular, temperature and magnetic field dependence, it is unambiguously shown
that the large second harmonic Hall voltage in TI heterostructures is governed
not by SOT but mainly by asymmetric magnon scattering mechanism without
magnetization oscillation. Thus, this method does not allow an accurate
estimation of spin Hall angle when magnons largely contribute to electron
scattering. Instead, the SOT contribution in a TI heterostructure is
exemplified by current pulse induced non-volatile magnetization switching,
which is realized with a current density of $\sim 2.5 \times 10^{10}
\mathrm{A/m}^2$, showing its potential as spintronic materials.

29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio