Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resonant driving of magnetization precession in a ferromagnetic layer by
  coherent monochromatic phonons   We realize resonant driving of the magnetization precession by monochromatic
phonons in a thin ferromagnetic layer embedded into a phononic Fabry-Perot
resonator. A femtosecond laser pulse excites resonant phonon modes of the
structure in the 10-40 GHz frequency range. By applying an external magnetic
field, we tune the precession frequency relative to the frequency of the
phonons localized in the cavity and observe the enormous increase in the
amplitude of the magnetization precession when the frequencies of free
magnetization precession and phonons localized in the cavity are equal.

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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: stat