Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Switching of magnons by electric and magnetic fields in multiferroic
  borates   Electric manipulation of magnetic properties is a key problem of materials
research. To fulfil the requirements of modern electronics, these processes
must be shifted to high frequencies. In multiferroic materials this may be
achieved by electric and magnetic control of their fundamental excitations.
Here we identify magnetic vibrations in multiferroic iron-borates which are
simultaneously sensitive to external electric and magnetic fields. Nearly 100%
modulation of the terahertz radiation in an external field is demonstrated for
SmFe3(BO3)4. High sensitivity can be explained by a modification of the spin
orientation which controls the excitation conditions in multiferroic borates.
These experiments demonstrate the possibility to alter terahertz magnetic
properties of materials independently by external electric and magnetic fields.

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The categories of this paper are: cs
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: physics
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci