Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical current under an optimal time-dependent polarization direction
  for Stoner particles in spin-transfer torque induced fast magnetization
  reversal   Fast magnetization reversal of uniaxial Stoner particles by spin-transfer
torque due to the spin-polarized electric current is investigated. It is found
that a current with a properly designed time-dependent polarization direction
can dramatically reduce the critical current density required to reverse a
magnetization. Under the condition that the magnitude and the polarization
degree of the current do not vary with time, the shape of the optimal
time-dependent polarization direction is obtained such that the magnetization
reversal is the fastest.

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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg