Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge ordering of magnetic monopoles in triangular spin ice patterns   Artificial spin ice offers the possibility to investigate a variety of
dipolar orderings, spin frustrations and ground states. However, the most
fascinating aspect is the realization that magnetic charge order can be
established without spin order. We have investigated magnetic dipoles arranged
on a honeycomb lattice as a function of applied field, using magnetic force
microscopy. For the easy direction with the field parallel to one of the three
dipole sublattices we observe at coercivity a maximum of spin frustration and
simultaneously a maximum of charge order of magnetic monopoles with alternating
charges $\pm$ 3.

6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th