Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In Quest of a Ferromagnetic Insulator -- Structure Controlled Magnetism
  in Mg-Ti-O Thin Films   Ferromagnetic insulator thin films can convey information by spin waves,
avoiding charge displacement and Eddy current losses. The sparsity of
high-temperature insulating ferromagnetic materials hinders the development of
spin wave based devices. Stoichiometric magnesium titanate, MgTiO$_3$, has an
electronic-energy-band structure in which all bands are either full or empty,
being a paramagnetic insulator. The MgTiO$_3$ ilmenite consists of ordered
octahedra and cation network in which one third of the octahedra are vacant,
one third host magnesium and one third titanium. By giving up these
characteristics, a rich variety of different magnetic structures can be formed.
Our experiments and electronic-energy-band-structure computations show that the
magnetic and electric properties of Mg-Ti-O films can drastically be changed
and controlled by Mg- and Ti-cation arrangement and abundancy in the octahedra.
Insulating titanium- and semiconducting magnesium-rich films were ferromagnetic
up to elevated temperatures. The presence and origin of ferromagnetic
insulating phase in the films is not apparent - the expectation, based on the
well-established rules set by Goodenough and Kanamori, is paramagnetic or
antiferromagnetic ordering. We show that ferro- and paramagnetic phases,
possessing the same stoichiometry, can be obtained by merely rearranging the
cations, thus allowing defect-free interfaces in multilayer structures.

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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: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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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: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org