Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Angular dependence and symmetry of Rashba spin torque in ferromagnetic
  heterostructures   In a ferromagnetic heterostructure, the interplay between a Rashba spin-orbit
coupling and an exchange field gives rise to a current-driven spin torque. In a
realistic device setup, we investigate the Rashba spin torque in the diffusive
regime and report two major findings: (i) a nonvanishing torque exists at the
edges of the device even when the magnetization and effective Rashba field are
aligned; (ii) anisotropic spin relaxation rates driven by the Rashba spin-orbit
coupling assign the spin torque a general expression ${\bm
T}=T^y_{\para}(\theta){\bm m}\times(\hat{\bm y}\times{\bm
m})+T^y_{\bot}(\theta)\hat{\bm y}\times{\bm m}+T^z_{\para}(\theta){\bm
m}\times(\hat{\bm z}\times{\bm m})+T^z_{\bot}(\theta)\hat{\bm z}\times{\bm m}$,
where the coefficients $T_{\para,\bot}^{y,z}$ depend on the magnetization
direction. Our results agree with recent experiments.

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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
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The categories of this paper are: econ
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin