Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twisted phase of the orbital-dominant ferromagnet SmN in a GdN/SmN
  heterostructure   The strong spin-orbit interaction in the rare-earth elements ensures that
even within a ferromagnetic state there is a substantial orbital contribution
to the ferromagnetic moment, in contrast to more familiar transition metal
systems, where the orbital moment is usually quenched. The orbital-dominant
magnetization that is then possible within rare-earth systems facilitates the
fabrication of entirely new magnetic heterostructures, and here we report a
study of a particularly striking example comprising interfaces between GdN and
SmN. Our investigation reveals a twisted magnetization arising from the large
spin-only magnetic moment in GdN and the nearly zero, but orbital-dominant,
moment of SmN. The unusual twisted phase is driven by (i) the similar ferromag-
netic Gd-Gd, Sm-Sm and Gd-Sm exchange interactions, (ii) a SmN Zeeman
interaction 200 times weaker than that of GdN, and (iii) the orbital-dominant
SmN magnetic moment. The element specificity of X-ray magnetic circular
dichroism (XMCD) is used in seperate modes probing both bulk and surface
regions, revealing the depth profile of the twisting magnetization.

14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio