Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Circularly polarised X-rays as a probe of non-collinear magnetic order
  in multiferroic TbMnO3   Non-resonant X-ray magnetic scattering has been used to study the magnetic
structure of multiferroic TbMnO3 in its ferroelectric phase. Circularly
polarized X-rays were combined with a full polarization analysis of the
scattered beam to reveal important new information on the magnetic structure of
this canonical multiferroic. An applied electric field is shown to create a
magnetic nearly mono-domain state in which the cylcoidal order on the Mn
sublattice rotates either clockwise or counter-clockwise depending on the sign
of the field. It is demonstrated how this technique provides sensitivity to the
absolute sense of rotation of the Mn moments, and to components of the ordering
on the Tb sublattice and phase shifts that earlier neutron diffraction
experiments could not resolve.

11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph