2008-05-012024-05-16https://scholars.lib.ntu.edu.tw/handle/123456789/667981摘要：在奈米尺度下關於傳輸及探測的研究不只提供了電子結構、形貌、及磁性上重要的資訊，且提供了操控奈米物質的可能性。而先進的奈米探測技術不但可以助於探測在奈米尺度下物質的性質，並且提供理論研究上更多相關的資訊。在其中研究超高真空自組裝規則排列的奈米結構是一個重要的課題。由自組裝形成的奈米結構可以很容易達到奈米或奈米以下的尺度，並且有很好的均勻性。而具有規則的排列及對稱性對於奈米物質而言，可進一步影響到其在物理性質及化學性質上的異向性。另一方面，異質系統因為它在傳輸和自旋相關行為方面的奇特性質，近來已成為一個非常吸引人的研究課題。有機／無機異質系統可以結合鐵磁性物質中的自旋電子特性和有機物質中相當大的自旋擴散長度兩種好處組合成所謂的有機自旋閥元件。因此研究有機／無機介面成長和其性質以及對於磁性特性的影響，是本研究領域的關鍵問題。本計畫研究新穎有機／無機異質奈米結構的傳輸性質、奈米磁性行為、與自旋相關現象。計畫中的理論部分將提供其物理機制的微觀了解，並進一步提供實驗上的前瞻構思。本計畫實驗主要目標之一為建造一用來成長新穎異質奈米結構的自旋傳輸性行為的超高真空系統，並結合自旋電子掃描穿隧顯微鏡的技術研究奈米尺度下的磁性結構。主要的研究系統是由不同材料的一維次及零維次自我組裝單元所成長的異質奈米結構，例如氧化物／磁性金屬奈米粒子與有機／無機自旋相關元件。 實驗進展方面。在鈷或鐵/氧化鋁/鎳鋁(100)機板的自組裝奈米粒子系統中，當使用較低的鍍膜速率以及較低的鍍膜溫度可以控制鈷奈米粒子有著較密度及較線性的排列。當系統進一步覆蓋上銅時，鐵或鈷奈米粒子的居禮溫度有著明顯的上升。此現象可能是由於覆蓋上去的銅可以提供額外的媒介、使得原本各自獨立的磁性粒子可以互相耦合。而在自旋磁化穿遂掃瞄探針SP-STM 相關之研究中，我們選用四點五個原子層厚的錳在鐵（001)單晶基座上當SP-STM的測試系統。當錳的厚度大過三個原子層，我們成功的測量出層狀的反鐵磁結構。這種空間上的反鐵磁結構是其他儀器無法直接觀察到的。關於異質接面相關的研究。我們研究的系統是碳六十在銅(100)機板上的成長模式。在成長時，碳六十顯透出多樣性的表面形貌。接下來，我們還要再進一步研究關於碳六十在磁性超薄膜金屬介面上，其電荷轉移對於磁性上的影響。 <br> Abstract: Nanoscale approaches, including nano-probing and nano-fabrication provide not only crucial information of electronic structures, morphology but also great opportunities for nanoengineering. In-situ self-assembly approach with UHV environment has become a very promising way for growing nanoparticles or nanostructure with uniform size distribution. The ordered alignment may induce anisotropy in physical and chemical properties. On the other hand, hetero-nanocomposite system has recently become a fascinating topic due to its novel properties in nanoscopic transport and spin related behavior. It can combine advantages from various materials in a nanodevice. The theoretical part of this project will benefit from the guidance of the theories to advance our frontier. The main goal of the experimental part of this project is incorporate both in-situ growth techniques of the self-assembled 0d and 1d hetero-nanostructures formed by various nanomaterials, and the recently developed low temperature spin-polarized probing (SP-STM) technique into multifunctional UHV system for the study on nanoscopic transport and nanomagnetic properties. The critical effects of organic/inorganic heterointerface due to electronic mismatch on transport and magnetic properties are the central issues of this project. In Co/Al2O3/NiAl(100) nanoparticle assembly, a slow deposition rate at low temperature promises the good linear alignment. Besides, capping of Cu overlayer on Fe and Co nanoparticle assembly induces significant Tc enhancement. This may be due to the additional coupling channels between magnetic nanoparticles provided by the Cu. For the SP-STM technique, we used is 4.5 ML Mn on Fe(001) substrate. Mn shows itself as layer-wised antiferromagnetism as coverage is thicker than 3 ML, which means we can get spin contrast between alternative layers. Such real space image of the spin structure of anti-ferromagnetism can`t be observed without SP-STM. In addition, the hetero-interface system C60 molecules adsorbed on the Cu(001) surface has been investigated by STM. It reveals that there is multi-type of the domain with different apparent heights. In next step, we will focus on the magnetic properties of ultrathin film influence by charge transfer from C60 adsorption低維度自組裝奈米粒子磁性異質結構自旋極化穿遂掃瞄式探針。Low dimensionself-assemblednanoparticlemagnetismhetero-structurespin-polarizedscanning tunneling microscopy