Helium bath cryostat with magnetic field and microwave system for confocal optically detected magnetic resonance and transport studies ('spintronic platform')

需要一个‘自旋电子测量平台’，它允许在不同的温度和磁场下研究样品，同时进行微波辐射。目标是两种类型的测量：共聚焦光学显微镜，例如在钻石的各个NV色心上光学检测到的磁共振，以及自由选择样品和磁场之间的相对取向的电子传输。Osnabrück大学缺乏类似的设置。钻石中的NV色心被用作其环境中电子自旋系统的量子传感器。这种系统可能是在现场制备的面体内富勒烯，用于信息处理中的量子比特，或者是自旋标记的分子，用于生物环境中的结构阐明。进一步的自旋携带分子或无机体系--例如稀土掺杂的纳米粒子--也可以用这种方法来研究。该平台需要很高的机械稳定性来进行此类研究，以及3D-压电扫描仪。输运测量对于碳纳米管场效应晶体管的研究是必不可少的。纳米管的化学修饰(例如，通过接枝或包裹其他分子)以及电触点的功能化(例如，通过集成隧道势垒和/或自旋过滤器)允许将晶体管用作新的检测器(对于前一种情况下的内部分子状态，作为具有可切换灵敏度的磁阻元件)。很好地控制纳米管和/或触头之间相对于磁场的取向是至关重要的。带有或不带有磁性分子附着层的磁性氧化层中的磁性传输将补充这些材料的现有全面分析技术(基于X射线或磁测量)。这将使特定的研究能够调整自旋电子学用超薄膜的磁电子结构。有机半导体器件(z.b.自旋阀、有机磁敏电阻)的磁输运依赖于能量变化很大的自旋态(从质子核态到强耦合电子自旋)。这种状态最好的研究方法是自旋共振。该平台将使我们能够通过量身定做的微谐振器在大范围的磁场和微波能量上实施电检测磁感应，以获得这一研究领域的根本新见解。特别令人感兴趣的是以最高精度改变样品/场几何形状或器件的光激发的可能性。

A 'spintronic measurment platform' is requested that allows to study samples at variable temperatures and magnetic fields with simultaneous microwave irradiation. Two types of measurement are targeted: confocal-optic microscopy such as optically detected magnetic resonance on individual NV color centers in diamond, and electronic transport with free choice of the relative orientation between sample and magnetic field. A comparable setup is lacking at the Universität Osnabrück.1. NV color centres in diamond are used as quantum sensors for electron spin systems in their environment. Such systems may be endohedral fullerenes, which are prepared on site for use as quantum bits in information processing, or spin-labelled molecules that serve for structure elucidation in biological environments. Further spin-carrying molecular or inorganic systems – e.g., rare-earth doped nano-particles – can also be studied with this method. The platform needs a high mechanical stability for such studies, as well as a 3D-piezo scanner.2. Transport measurements are essential for the study of field-effect transistors based on carbon nanotubes. Chemical modifications of the nanotube (e.g., by grafting or encapsulating other molecules) as well as a functionalization of the electrical contacts (e.g., by integrating tunnel barriers and/or spin filters) allow to use the transistors as novel detectors (for internal molecular states in the former case, as magnetoresistive elements with switchable sensitivity in the latter case). Good control of the orientation between nanotubes and/or contacts relative to the magnetic field is of utmost importance.3. Magnetotransport in magnetic oxide layers with or without magnetic molecular adlayers will complement the available comprehensive set of analysis techniques (X-Ray based or magnetometry) for these classes of materials. This will enable specific studies to tune the magnetoelectronic structure of ultrathin films for spintronics.4. Magnetotransport in organic semiconducting devices (z.B. spin valves, organic magnetoresistors) depends on spin states of largely varying energy (from proton nuclear states to strongly coupled electron spins). Such states can be best studied by spin resonance. The platform will enable us to implement electrically detected magnetic reonance over large spans of magnetic fields and microwave energies via tailored micro-resonators to gain fundamentally new insights in this research area. Of particular interest is the possibility to vary either the sample/field geometry or the optical excitation of the devices with highest precision.