Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exchange scattering as the driving force for ultrafast all-optical and
  bias-controlled reversal in ferrimagnetic metallic structures   Experimentally observed ultrafast all-optical magnetization reversal in
ferrimagnetic metals and heterostructures based on antiferromagnetically
coupled ferromagnetic $d-$ and $f-$metallic layers relies on intricate energy
and angular momentum flow between electrons, phonons and spins. Here we treat
the problem of angular momentum transfer in the course of ultrafast
laser-induced dynamics in a ferrimagnetic metallic system using microscopical
approach based on the system of rate equations. We show that the magnetization
reversal is supported by a coupling of $d-$ and $f-$ subsystems to delocalized
$s-$ or $p-$ electrons. The latter can transfer spin between the two subsystems
in an incoherent way owing to the $(s;p)-(d;f)$ exchange scattering. Since the
effect of the external excitation in this process is reduced to the transient
heating of the mobile electron subsystem, we also discuss possibility to
trigger the magnetization reversal by applying a voltage bias pulse to
antiferromagnetically coupled metallic ferromagnetic layers embedded in point
contact or tunneling structures. We argue that such devices allow controlling
reversal with high accuracy. We also suggest to use the anomalous Hall effect
to register the reversal, thus playing a role of reading probes.

22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg