Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetotransport in ferromagnetic Fe$_2$Ge semimetallic thin films   Thin films of the ferromagnet Fe$_2$Ge were grown via molecular beam epitaxy,
and their electrical and magneto-transport properties measured for the first
time. X-ray diffraction and vibrating sample magnetometry measurements
confirmed the crystalline ferromagnetic Fe$_2$Ge phase. The observed high
temperature maximum in the longitudinal resistivity, as well as the observed
suppression of electron-magnon scattering at low temperatures, point to the
presence of strong spin polarization in this material. Measurements of the Hall
resistivity, $\rho_{xy}$, show contributions from both the ordinary Hall effect
and anomalous Hall effect, $\rho_{xy}^{AH}$, from which we determined the
charge carrier concentration and mobility. Measurements also show a small
negative magnetoresistance in both the longitudinal and transverse geometries.
Fe$_2$Ge holds promise as a useful spintronic material, especially for its
semiconductor compatibility.

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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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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: q-fin