Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-resolved imaging of magnetoelectric domain switching in
  multiferroic MnWO4   By an electrical-pump--optical-probe technique we show that the
electric-field-induced reversal of the magnetic order parameter in multiferroic
MnWO$_4$ occurs on the time scale of milliseconds and maintains a rigid
coupling of the magnetization to the magnetically induced electric
polarization. The temporal progression of the spatially resolved domain
structure was imaged with nanosecond resolution by optical second harmonic
generation and compared to the quasi-static domain reversal. A qualitative
model gives an estimate of why the magnetoelectric order-parameter reversal in
the magnetically induced ferroelectrics is not inherently ultrafast.

6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math