Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetization of ultrathin (Ga,Mn)As layers   Kerr rotation and Superconducting QUantum Interference Device (SQUID)
magnetometry measurements were performed on ultrathin
(Ga$_{0.95}$Mn$_{0.05}$)As layers. The thinner layers (below 250 \AA) exhibit
magnetic properties different than those of thicker ones, associated with
different microstructure, and some degree of inhomogeneity. The temperature
dependence of the field-cooled-magnetization of the layers is recorded after
successive low temperature annealings. While the Curie temperature of the
thicker layer (250 \AA) is nearly unchanged, the critical temperature of the
thinner layers is enhanced by more than 23 K after two annealings. Secondary
Ion Mass Spectrometry (SIMS) experiments on similar layers show that Mn is
displaced upon annealing. The results are discussed considering a possible
segregation of substitutional and interstitial Mn atoms at the surface of the
(Ga,Mn)As layers.

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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: alg-geom