Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast laser excitation of spin waves by permanent modification of
  the exchange bias interaction in IrMn/Co   This paper has been withdrawn by the authors due to a critical error
discovered in Figures 1, 2 and 4.

19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th