Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magneto-Coulomb Oscillation in Ferromagnetic Single Electron Transistors   The mechanism of the magneto-Coulomb oscillation in ferromagnetic single
electron transistors (SET's) is theoretically considered. Variations in the
chemical potentials of the conduction electrons in the ferromagnetic island
electrode and the ferromagnetic lead electrodes in magnetic fields cause
changes in the free energy of the island electrode of the SET. Experimental
results of the magneto-Coulomb oscillation in a Ni/Co/Ni ferromagnetic SET are
presented and discussed. Possible applications of this phenomenon are also
discussed.

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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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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: nlin
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The categories of this paper are: dg-ga