Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Control of ultrashort spin current pulses in metallic multilayers   We study the emission of femtosecond spin current pulses at Fe/Au interfaces.
Using optical second harmonic generation we demonstrate the control of pulse
shape and duration by varying the emitter thickness and show that it is
determined by the parameters of hot electrons emission and the diffusive
transport. Using a simple model of electron emission we develop a description
of superdiffusive spin transport in Au allowing to extract electron velocity
and scattering rates from the experimental data. The importance of carrier
multiplication in Fe is demonstrated.

27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci