Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A unified description of collective magnetic excitations   In this work, we define a set of analytic tools to describe the dynamic
response of the magnetization to small perturbations, which can be used on its
own or in combination with micromagnetic simulations and does not require
saturation. We present a general analytic description of the ferromagnetic high
frequency susceptibility tensor to describe angular as well as frequency
dependent ferromagnetic resonance spectra and account for asymmetries in the
line shape. Furthermore, we expand this model to reciprocal space and show how
it describes the magnon dispersion. Finally we suggest a trajectory dependent
solving tool to describe the equilibrium states of the magnetization.

5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat