Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: All-Optical Control of Magnetization in Quantum-Confined Ultrathin
  Magnetic Metals   All-optical control dynamics of magnetization in sub-10 nm metallic thin
films are investigated, as these films with quantum confinement undergo unique
interactions with femtosecond laser pulses. Our theoretical derivations based
on the free electron model show that the density of states at Fermi level
(DOS_F) and electron-phonon coupling coefficients (G_ep) in ultrathin metals
have very high sensitivity to film thickness within a few Angstroms. As DOS_F
and G_ep depend on thickness, we show that completely different magnetization
dynamics characteristics emerge compared with bulk metals. Our model suggests
highly-efficient energy transfer from fs laser photons to spin waves due to
minimal energy absorption by phonon. This sensitivity to thickness and
efficient energy transfer offers an opportunity to obtain ultrafast on-chip
magnetization dynamics.

31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph