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Role of doped Ru in coercivity-enhanced La$_{0.6}$Sr$_{0.4}MnO$_3$ thin film studied by x-ray magnetic circular dichroism

The coercivity of La$_{1-x}$Sr$_x$MnO$_3$ thin films can be enhanced by Ru substitution for Mn. In order to elucidate its mechanism, we performed soft x-ray absorption and magnetic circular dichroism measurements at the Ru M$_{2,3}$ and Mn L$_{2,3}$ edges. We found that the spin direction of Ru and Mn are opposite and that Ru has a finite orbital magnetic moment. Cluster-model analysis indicated that the finite orbital magnetic moment as well as the reduced spin moment of Ru result from local lattice distortion caused by epitaxial strain from the SrTiO$_3$ substrate in the presence of spin-orbit interaction.

preprint2013arXivOpen access
T. HaranoG. ShibataK. IshigamiY. TakashashiV. K. VermaV. R. SinghT. KadonoA. FujimoriY. TakedaT. OkaneY. SaitohH. YamagamiT. KoideH. YamadaA. SawaM. KawasakiY. TokuraA. Tanaka
cond-mat.str-elcond-mat.mtrl-sci
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Open access18 authors2 topics
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T. HaranoG. ShibataK. IshigamiY. TakashashiV. K. VermaV. R. SinghT. KadonoA. FujimoriY. TakedaT. OkaneY. SaitohH. YamagamiT. KoideH. YamadaA. SawaM. KawasakiY. TokuraA. Tanaka

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