Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Defect induced magnetism and super spin glass state in reactive ion beam
  deposited nano structured AlN thin films   Defect induced magnetism is reported in undoped aluminium nitride thin films
deposited using reactive ion beam sputtering of aluminium in nitrogen plasma.
The films have been deposited on silicon substrate at different temperatures.
Existence of the defects in the films have been verified using room temperature
photo-luminescence measurements. Owing to nano crystalline nature of the films,
super-magnetic ground states have been observed. A cross-over from super
paramagnetic to super spin glass state has been observed as the grain density
increases. Detailed magnetisation measurements along with AC susceptibility
measurements have been used to determine the ground states in these AlN thin
films.

29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an