Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Current-driven domain wall motion in thin ferromagnetic wires   The coupling between a current and a Bloch wall is examined in the half-metal
limit of the double exchange model. The conduction electrons transfer angular
momentum to the Bloch wall with 100% efficiency in the absence of pinning. The
wall is displaced without distortion with velocity proportional to the current.
In the presence of a pinning potential either the angular momentum is destroyed
by the perpendicular component of the anisotropy field or is converted to
coherent magnons. A moving wall has its velocity reduced by pinning. The
expression for the velocity agrees surprisingly well with experiment.

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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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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: adap-org