Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Landauer theory of ballistic torkances in non-collinear spin valves   We present a theory of voltage-induced spin-transfer torques in ballistic
non-collinear spin valves. The torkance on one ferromagnetic layer is expressed
in terms of scattering coefficients of the whole spin valve, in analogy to the
Landauer conductance formula. The theory is applied to Co/Cu/Ni(001)-based
systems where long-range oscillations of the Ni-torkance as a function of Ni
thickness are predicted. The oscillations represent a novel quantum size effect
due to the non-collinear magnetic structure. The oscillatory behavior of the
torkance contrasts a thickness-independent trend of the conductance.

7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
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The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph