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

具有磁场和微波系统的氦浴低温恒温器，用于共焦光学检测磁共振和输运研究（“自旋电子平台”）

• 批准号: 431696304
• 金额: --
• 依托单位: Universität Osnabrück
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/431696304?language=en
• 关键词: Helium; bath; cryostat; magnetic; field

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.

一个'自旋电子测量平台'的要求，允许研究样品在可变的温度和磁场与同时微波辐射。有两种类型的测量是有针对性的：共焦光学显微镜，如光学检测的磁共振在钻石中的个别NV色心，和电子传输与样品和磁场之间的相对取向的自由选择。奥斯纳布吕克大学缺乏类似的设置。1.金刚石中的NV色心被用作其环境中电子自旋系统的量子传感器。这种系统可能是内嵌富勒烯，它是在现场制备的，用作信息处理中的量子比特，或者是用于生物环境中结构解析的自旋标记分子。进一步的自旋携带分子或无机系统-例如，稀土掺杂的纳米颗粒也可以用这种方法进行研究。该平台需要高的机械稳定性进行此类研究，以及3D压电扫描仪。2.输运测量对于基于碳纳米管的场效应晶体管的研究至关重要。纳米管的化学改性（例如，通过接枝或包封其它分子）以及电接触的功能化（例如，通过集成隧道势垒和/或自旋滤波器）允许使用晶体管作为新颖的检测器（在前一种情况下用于内部分子状态，在后一种情况下作为具有可切换灵敏度的磁阻元件）。纳米管和/或触点之间相对于磁场的取向的良好控制是至关重要的。3.磁性氧化物层中的磁输运（有或没有磁性分子吸附层）将补充这些类别材料的可用综合分析技术（基于X射线或磁力测定法）。这将使具体的研究，以调整的磁电子结构的薄膜自旋电子学。有机半导体器件中的磁输运（z.B.自旋阀、有机磁阻器）取决于能量变化很大的自旋状态（从质子核态到强耦合电子自旋）。这种状态可以通过自旋共振进行最好的研究。该平台将使我们能够通过定制的微谐振器在大范围的磁场和微波能量上实现电检测磁共振，从而在这一研究领域获得全新的见解。特别令人感兴趣的是改变样品/场几何形状或具有最高精度的设备的光学激发的可能性。