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XMCD studies of magnetic polarization at Mo atoms in CoMo alloy and magnetically coupled Co/Mo multilayers
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Andrzej Wawro Ewelina Milińska Zbigniew Kurant Aleksiej Pietruczik Jarosław Kanak Katharina Ollefs Fabrice Wilhelm Andrei Rogalev Andrzej Maziewski 《Journal of synchrotron radiation》2018,25(5):1400-1407
Magnetic polarization of Mo atoms in Co96Mo4 alloy film and Co/Mo multilayered structures has been studied by X‐ray magnetic circular dichroism. Samples with Mo spacers of two different thicknesses (0.9 nm and 1.8 nm) were investigated. Mo atoms receive a magnetic moment of ?0.21μB in the alloy. In the multilayer with the thinner Mo spacer (dMo = 0.9 nm) the magnetic moment is much smaller (?0.03μB). In both cases the measured induced moment at the Mo site is oriented antiparallel to the moment at the Co atoms. The presence of the induced moment in the Mo spacer coincides with antiferromagnetic coupling between the Co component slabs. In contrast, neither measurable induced moment at the Mo site nor interlayer coupling between the Co layers has been found for the multilayer with the thicker Mo spacer. Possible mechanisms of the coupling associated with the induced moment are discussed in detail. 相似文献
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R. Aleksiejūnas S. Krotkus S. Nargelas S. Miasojedovas S. Juršėnas 《Physica B: Condensed Matter》2011,406(15-16):2990-2993
Light-induced transient grating and photoluminescence measurements were employed for carrier recombination studies in variously Mg doped GaN layers. Carrier lifetime and ambipolar diffusion coefficient were found to decrease with doping from 210 to 20 ps and from 2.0 to 0.9 cm2/s,respectively, which proved the degradation of electrical quality of the layers. A threshold of stimulated emission was found to depend non-monotonously on doping and had the lowest value of 0.19 mJ/cm2 in the most doped layer. This dependence was explained in terms of degeneracy of the hole system. 相似文献
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