Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Breaking Space Inversion-Symmetry to Obtain Asymmetric Spin-Wave
  Excitation in Systems with Nonuniform Magnetic Exchange   We report on the consequences of non-uniform exchange in magnetic systems.
The quantum mechanical exchange interaction between spins is responsible for
the phenomenon of magnetic order, and is generally considered to be uniform
across bulk magnetic systems. Partly inspired by the Dzyaloshinskii-Moriya
interaction--also known as antisymmetric exchange--we use a linearly varying
exchange interaction along a magnetic strip as a route to spatial inversion
symmetry-breaking. We find that, in addition to asymmetric modes and
localization, spatially-varying exchange can be used to design nonreciprocal
magnetic signal excitation at frequencies that are tunable. Moreover, our work
predicts nonreciprocity to occur across a vast range of frequencies up to
hundreds of GHz. Such spin wave engineering is a key area of ongoing research
in the fields of magnonics and spintronics, which are expected to enable the
next generation of communication technology. Analogous nonreciprocity is
expected to occur in other wave systems with gradient properties.

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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an