Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Epitaxial growth of Fe3O4 thin films on ZnO and MgO substrates   Magnetite thin fims have been grown epitaxially on ZnO and MgO substrates
using molecular beam epitaxy. The film quality was found to be strongly
dependent on the oxygen partial pressure during growth. Structural, electronic,
and magnetic properties were analyzed utilizing Low Energy Electron Diffraction
(LEED), HArd X-ray PhotoElectron Spectroscopy (HAXPES), Magneto Optical Kerr
Effect (MOKE), and X-ray Magnetic Circular Dichroism (XMCD). Diffraction
patterns show clear indication for growth in the (111) direction on ZnO.
Vertical structure analysis by HAXPES depth profiling revealed uniform
magnetite thin films on both type of substrates. Both, MOKE and XMCD
measurements show in-plane easy magnetization with a reduced magnetic moment in
case of the films on ZnO.

31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
18
The categories of this paper are: econ
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph