Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Switching spin valves using r.f. currents   We show that magnetization reversal in spin-injection devices can be
significantly faster when using a chirped r.f. rather than d.c current pulse.
Alternatively one can use a simple sinusoidal r.f. pulse or an optimized series
of alternating, equal-amplitude, square pulses of varying width (a digitized
approximation to a chirped r.f. pulse) to produce switching using much smaller
currents than with a d.c. pulse.

27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th