Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conductance fingerprints of non-collinear magnetic states in single atom
  contacts: a first-principles Wannier functions study   We present a first-principles computational scheme for investigating the
ballistic transport properties of one-dimensional nanostructures with
non-collinear magnetic order. The electronic structure is obtained within
density functional theory as implemented in the full-potential linearized
augmented plane-wave (FLAPW) method and mapped to a tight-binding like
transport Hamiltonian via non-collinear Wannier functions. The conductance is
then computed based on the Landauer formula using the Green's function method.
As a first application we study the conductance between two ferromagnetic Co
monowires terminated by single Mn apex atoms as a function of Mn-Mn separation.
We vary the Mn-Mn separation from the contact (about 2.5 to 5 {\AA}) to the far
tunneling regime (5 to 10 {\AA}). The magnetization direction of the Co
electrodes is chosen either in parallel or antiparallel alignment and we allow
for different spin configurations of the two Mn spins. In the tunneling and
into the contact regime the conductance is dominated by $s$-$d_{z^2}$-states.
In the close contact regime (below 3.5 {\AA}) there is an additional
contribution for a parallel magnetization alignment from the $d_{xz}$- and
$d_{yz}$-states which give rise to an increase of the magnetoresistance as it
is absent for antiparallel magnetization. If we allow the Mn spins to relax a
non-collinear spin state is formed close to contact. We demonstrate that the
transition from a collinear to such a non-collinear spin structure as the two
Mn atoms approach leaves a characteristic fingerprint in the distance-dependent
conductance and magnetoresistance of the junction. We explain the effect of the
non-collinear spin state on the conductance based on the spin-dependent
hybridization between the $d_{xz,yz}$-states of the Mn spins and their coupling
to the Co electrodes.

23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc