Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical current and linewidth reduction in spin-torque nano-oscillators
  by delayed self-injection   Based on theoretical models, the dynamics of spin-torque nano-oscillators can
be substantially modified by re-injecting the emitted signal to the input of
the oscillator after some delay. Numerical simulations for vortex magnetic
tunnel junctions show that with reasonable parameters this approach can
decrease critical currents as much as 25 % and linewidths by a factor of 4.
Analytical calculations, which agree well with simulations, demonstrate that
these results can be generalized to any kind of spin-torque oscillator.

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The categories of this paper are: hep-lat
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The categories of this paper are: stat
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: eess