超微細構造半導体上磁性ドットの量子干渉複合界面効果の研究

本项目取得的重要成果之一是观察到了体态非磁性的纳米级Au、Pd颗粒中的特殊铁磁磁化强度。对Pd/Ni的表面磁化强度(表面模)进行了估算，得到了Pd/Ni的表面特性。表面较大的位势变化导致了较大的自旋-轨道相互作用，使ESR发生g-位移。g-垃圾使卫星结构接近ESR信号的主线。Ni/Pd界面表现出巨磁矩效应。结果表明，表面的作用并不是很大，这意味着存在与纳米粒子结构有关的自旋极化的某种内源。通过ESR测量，还观察到了界面对GaAsNi条的影响。并尝试了磁库仑阻挡结构的初步实验。证实了通过砷化镓衬底的Ni自旋之间的磁耦合。

One of the important result obtained in this project is the observation of special ferromagnetic magnetization observed in nano-size particles of Au, Pd and which are non-magnetic in their bulk state. The magnetization at the surface (surface mode) in Pd/Ni was estimated and characteristics of the surface could be also obtained. The large potential change at the surface induces large spin-orbit interaction which makes g-shift of ESR.The g-shit makes the satellite structure near the main line of the ESR signal. The interface between Ni and Pd shows giant magnetic moment effect. By using the effect, we can recognize the characteristics of the surface mode ESR.According to the result, role of the surface is not so large and it means existence of some intrinsic origin of the spin polarization related with nano-particle structure. Interface effect on Ni stripes on the GaAs was also observed by ESR measurement. The preliminary experiment of the magnetic Coulomb blockade structure was also attempted. The magnetic coupling among the Ni spins through GaAs substrates are confirmed.