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Tivakornsasithorn, Kritsanu,Yoo, Taehee,Lee, Hakjoon,Choi, Seonghoon,Lee, Sanghoon,Liu, Xinyu,Dobrowolska, M.,Furdyna, Jacek K. Elsevier 2017 Solid state communications Vol.253 No.-
<P><B>Abstract</B></P> <P>Interlayer exchange coupling (IEC) between GaMnAs layers in GaMnAs/InGaAs/GaMnAs tri-layers was studied by magnetization measurements. Minor hysteresis loops are observed to shift in a direction indicating the presence of ferromagnetic (FM) IEC in the structures. The strength of the FM IEC clearly exhibits an exponential decrease with respect to nonmagnetic InGaAs spacer thickness. The fitting of the spacer thickness dependence of the FM IEC to an exponential decay function provides a decay length of 3.3±0.3nm, which is relatively large compared to metallic multilayers, indicating a long ranged IEC in systems based on GaMnAs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Interlayer exchange coupling (IEC) between GaMnAs layers with out-of-plane anisotropy has been investigated. </LI> <LI> The IEC between GaMnAs layers turned out to be ferromagnetic interaction. </LI> <LI> The strength of IEC monotonically decreases with GaAs spacer thickness. </LI> <LI> The IEC decay length of GaMnAs systems was an order of magnitude larger than that of metallic system. </LI> </UL> </P>
Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn<sup>2+</sup> quantum nanoribbons
Yu, Jung Ho,Liu, Xinyu,Kweon, Kyoung Eun,Joo, Jin,Park, Jiwon,Ko, Kyung-Tae,Lee, Dong Won,Shen, Shaoping,Tivakornsasithorn, Kritsanu,Son, Jae Sung,Park, Jae-Hoon,Kim, Young-Woon,Hwang, Gyeong S.,Dobro Nature Publishing Group 2010 Nature Materials Vol.9 No.1
Doping of semiconductor nanocrystals by transition-metal ions has attracted tremendous attention owing to their nanoscale spintronic applications. Such doping is, however, difficult to achieve in low-dimensional strongly quantum confined nanostructures by conventional growth procedures. Here we demonstrate that the incorporation of manganese ions up to 10% into CdSe quantum nanoribbons can be readily achieved by a nucleation-controlled doping process. The cation-exchange reaction of (CdSe)<SUB>13</SUB> clusters with Mn<SUP>2+</SUP> ions governs the Mn<SUP>2+</SUP> incorporation during the nucleation stage. This highly efficient Mn<SUP>2+</SUP> doping of the CdSe quantum nanoribbons results in giant exciton Zeeman splitting with an effective g-factor of ∼600, the largest value seen so far in diluted magnetic semiconductor nanocrystals. Furthermore, the sign of the s–d exchange is inverted to negative owing to the exceptionally strong quantum confinement in our nanoribbons. The nucleation-controlled doping strategy demonstrated here thus opens the possibility of doping various strongly quantum confined nanocrystals for diverse applications.