Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sign-tunable anisotropic magnetoresistance and electrically detectable
  dual magnetic phases in a helical antiferromagnet   The helimagnetic order describes a non-collinear spin texture of
antiferromagnets, arising from competing exchange interactions. Although
collinear antiferromagnets are elemental building blocks of antiferromagnetic
(AFM) spintronics, the potential of implementing spintronic functionality in
non-collinear antiferromagnets has not been clarified thus far. Here, we
propose an AFM helimagnet of EuCo2As2 as a novel single-phase spintronic
material that exhibits a remarkable sign reversal of anisotropic
magnetoresistance (AMR). The contrast in the AMR arises from two electrically
distinctive magnetic phases with spin reorientation driven by magnetic field
lying on the easy-plane, which switches the sign of the AMR from positive to
negative. Further, various AFM memory states associated with the evolution of
the spin structure under magnetic fields were identified theoretically, based
on an easy-plane anisotropic spin model. These results reveal that
non-collinear antiferromagnets hold potential for developing spintronic
devices.

2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph