Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconventional relaxation in antiferromagnetic CoRh$_2$O$_4$
  nanoparticles   Magnetic relaxation in antiferromagnetic CoRh$_2$O$_4$ nanoparticles is
investigated at 2 K by cooling the sample from a temperature (70 K) well above
the antiferromagnetic ordering temperature at 27 K, following zero field cooled
(ZFC) and field cooled (FC) process. In ZFC process, the sample at 2 K is
subsequently followed by magnetic field on and off sequences, whereas in FC
process the cooling field is made off during measurement of remanent
magnetization as a function of time. The experiments suggest an unconventional
relaxation behaviour in the system, as an effect of increasing surface exchange
anisotropy with decreasing the size of antiferromagnetic nanoparticles.

20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess