Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Invariant form of spin-transfer switching condition   We derive an invariant form of the current-induced switching condition in
spin-transfer devices and show that for energy minima and maxima the "switching
ability" of the current is determined by the spin torque divergence. In
contrast, energy saddle points are normally stabilized by current-induced
merging with other equilibria. Our approach provides new predictions for
several experimental setups and shows the limitations of some frequently used
approximations.

33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex