Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin- and Symmetry-Filtering Combined Tunnel Magnetoresistance through
  Epitaxial MgO/EuS Tunnel Barriers   We created epitaxial magnetic tunnel junctions of FeCo/MgO/EuS on MgO
buffered Si (100). Tunnel magnetoresistance reached up to 64% at 4.2 K. An
unexpected fast drop of magnetoresistance was recorded for MgO thickness above
1 nm, which is attributed to the forced nonspecular conductance across the EuS
conduction band minimum located at the X point, rather than the desired Delta_1
conductance centered around the Gamma point.

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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: funct-an
2
The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: stat