Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconventional Magnetization of Fe3O4 Thin Film Grown on Amorphous SiO2
  Substrate   High quality single crystal Fe3O4 thin films with (111) orientation had been
prepared on amorphous SiO2 substrate by pulsed laser deposition. The
magnetization properties of the films are found to be highly unconventional.
The Verwey transition temperature derived from the magnetization jump is around
140K, which is higher than the bulk value and it can be slightly suppressed by
out-plane magnetic field; the out-of-plane magnetization, which is unexpectedly
higher than the in-plane value, is also significantly increased as compared
with the bulk value. Our findings suggest that the local Coulomb correlation U
and the effective ferromagnetic exchange interaction J of Fe 3d electrons are
both dramatically strengthened and out-of-plane directionally entangled by the
unusual coupling between Fe3O4 thin film and the amorphous SiO2 substrate.

37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom