Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Femtosecond Photocurrents at the Pt/FeRh Interface   Femtosecond laser excitation of FeRh/Pt bilayers launches an ultrafast pulse
of electric photocurrent in the Pt-layer and thus results in emission of
electromagnetic radiation in the THz spectral range. Analysis of the THz
emission as a function of polarization of the femtosecond laser pulse, external
magnetic field, sample temperature and sample orientation shows that
photocurrent can emerge due to vertical spin pumping and photo-induced inverse
spin-orbit torque at the FeRh/Pt interface. The vertical spin pumping from FeRh
to Pt does not depend on the polarization of light and originates from
ultrafast laser-induced demagnetization of the ferromagnetic phase of FeRh. The
photo-induced inverse spin-orbit torque at the FeRh/Pt interface can be
described in terms of a helicity-dependent effect of circularly polarized light
on the magnetization of the ferromagnetic FeRh and subsequent generation of a
photocurrent.

33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
37
The categories of this paper are: supr-con