Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Highly efficient spin current generation by the spin Hall effect in
  Au$_{1-x}$Pt$_x$   We report very efficient spin current generation by the spin Hall effect in
the alloy Au0.25Pt0.75, which, as determined by two different direct spin-orbit
torque measurements, exhibits a giant internal spin Hall ratio of > 0.58
(anti-damping spin-orbit torque efficiency of ~ 0.35 in bilayers with Co), a
relatively low resistivity of ~ 83 uOhm cm, an exceptionally large spin Hall
conductivity of > 7.0x10^5 ohm^-1 m^-1, and a spin diffusion length of 1.7 nm.
This work establishes Au0.25Pt0.75 as a milestone spin current generator that
provides greater energy efficiency than that yet obtained with other heavy
metals or with the topological insulators Bi2Se3 and (Bi,Se)2Te3. Our findings
should advance spin-orbit torque-based fundamental research and benefit the
development of new fast, efficient spin-orbit torque-driven magnetic memories,
skyrmion and chiral domain wall devices, and microwave and terahertz emitters.

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The categories of this paper are: hep-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int