Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ca3(Ru1-xCrx)2O7: A new paradigm for spin valves   The spin valve effect is a quantum phenomenon so far only realized in
multilayer thin films or heterostructures. Here we report a strong spin valve
effect existing in bulk single crystals of Ca3(Ru1-xCrx)2O7 having an
anisotropic, bilayered crystal structure. This discovery opens new avenues to
understand the underlying physics of spin valves, and fully realize its
potential in practical devices.

9
The categories of this paper are: nlin
16
The categories of this paper are: stat
19
The categories of this paper are: eess
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin