Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunneling anomalous Hall effect in the nanogranular CoFe-B-Al-O films
  near the metal-insulator transition   We present results of experimental studies of structural, magneto-transport
and magnetic properties of CoFe-B-Al-O films deposited onto a glass ceramic
substrate by the ion-beam sputtering of the target composed of Co40Fe40B20 and
Al2O3 plates. The system consists on the strained crystalline CoFe metallic
nanogranules with the size 2-5 nm which are embedded into the B-Al-O oxide
insulating matrix. Our investigations are focused on the anomalous Hall effect
(AHE) resistivity Rh and longitudinal resistivity R at T=5-200 K on the
metallic side of metal-insulator transition in samples with the metal content
x=49-56 at.%, that nominally corresponds to (Co40Fe40B20)x(Al2O3)100-x in the
formula approximation. The conductivity at T > 15 K follows the lnT behavior
that matches a strong tunnel coupling between nanogranules. It is shown that
the scaling power-laws between AHE resistivity and longitudinal resistivity
strongly differ, if temperature T or metal content x are variable parameters:
Rh(T)~R(T)^0.4-0.5 obtained from the temperature variation of R and Rh at fixed
x, while Rh(x)/x~R(x)^0.24, obtained from measurements at the fixed low
temperature region (10-40 K) for samples with different x. We qualitatively
describe our experimental data in the frame of phenomenological model of two
sources of AHE e.m.f. arising from metallic nanogranules and insulating
tunneling regions, respectively, at that the tunneling AHE (TAHE) source is
strongly shunted due to generation of local circular Hall currents. We consider
our experimental results as the first experimental proof of the TAHE
manifestation.

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The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
2
The categories of this paper are: math
1
The categories of this paper are: cs
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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: acc-phys
7
The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci