Giant effective g -factor in Pb x Eu 1 − x Te epitaxial films

We investigated Pb x Eu 1 − x Te films with x ⩽ 0.2 by magneto-optical measurements. For x ∼ 0.01 , the optical emission is similar to high quality EuTe films with two narrow lines attributed to excitonic recombinations associated with magnetic polarons. For increasing x , the emission becomes domin...

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Published in:Applied physics letters 2008-07, Vol.93 (3), p.031903-031903-3
Main Authors: Heredia, E., de Oliveira Rappl, P. H., Motisuke, P., Gazoto, A. L., Iikawa, F., Brasil, M. J. S. P.
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Summary:We investigated Pb x Eu 1 − x Te films with x ⩽ 0.2 by magneto-optical measurements. For x ∼ 0.01 , the optical emission is similar to high quality EuTe films with two narrow lines attributed to excitonic recombinations associated with magnetic polarons. For increasing x , the emission becomes dominated by a broader lower energy band, which is very efficient as compared to the binary emission. The magneto-optical properties of the ternary films show various similarities with EuTe results, such as quenchings at similar temperatures and magnetic fields. Most remarkably, they also present a giant effective g -factor that makes this material a strong candidate for spintronic applications.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2961018