Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large Tunneling Anisotropic Magnetoresistance mediated by Surface States   We investigated the tunneling anisotropic magnetoresistance (TAMR) in thick
hcp Co films at cryogenic temperatures using scanning tunneling microscopy. At
around -350 mV, a strong TAMR up to 30\% is found with a characteristic voltage
dependence and a reversal of sign. With the help of \textit{ab initio}
calculations the TAMR can be traced back to a spin-polarized occupied surface
states that experience a strong spin-orbit interaction leading to a
magnetization direction depending hybridization with bulk states.

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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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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: q-bio
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat