Cryogen Free Split Pair Magnet Cryostat with Optical Access and Automated Sample Rotation

具有光学接入和自动样品旋转功能的无制冷剂分裂对磁体低温恒温器

• 批准号: 531527874
• 金额: --
• 依托单位: Universität Konstanz
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2024
• 资助国家: 德国
• 起止时间: 2023-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/531527874?language=en
• 关键词: Cryogen; Free; Split; Pair; Magnet

Experiments in large magnetic fields and at low temperatures are of fundamental importance for the investigation of magnetic thin films and heterostructures. The dry magnet cryostat system with superconducting split-pair magnet, variable temperature insert and optical access applied for here shall be used for the investigation of spin-caloritronic transport phenomena, magnetization dynamics and magnetization damping, magneto-optical effects and spin fluctuation phenomena as a function of magnetic field strength, magnetic field direction and temperature. One key feature of the system is the closed (“dry”) cooling circuit, which makes the refilling of cryogenic liquids obsolete and thus allows for uninterrupted, highly sensitive measurements over several days or even weeks. A second key feature of the system is the capability to automatically rotate the entire sample rod around the vertical cryostat axis. Thus, the orientation of the horizontal magnetic field relative to the sample can be adjusted remotely, via computer control. In this way, "angle-dependent" measurement data (i.e. data as a function of the angle enclosed between sample and magnetic field) can be systematically and reproducibly record for a given, constant magnetic field magnitude. The sample hereby is rigidly mounted onto the rotatable sample rod. It can therefore be thermally stabilized and electrically contacted in the best possible way - an important prerequisite for the planned highly sensitive transport and fluctuation experiments, as well as for broadband spin dynamics measurements. Last but not least, windows provide optical access to the sample in the horizontal plane, parallel and perpendicular to the magnetic field. In addition to magneto-optical experiments, this makes it possible to generate local temperature gradients via focused laser radiation. Overall, the magnet cryostat system applied for here therefore is ideally suited for our current and planned research work, e.g., for the quantitative investigation of spin-caloritronic phenomena such as the anomalous Hall and Nernst effect in altermagnetic or antiferromagnetic thin films along different crystal directions, the measurement of spin and magnon currents in magnetic garnet or orthoferrite samples, in particular also across magnetic phase transitions, or the study of magnetization dynamics and magnetic anisotropy in magnetic films and heterostructures.

在大磁场和低温下进行的实验对于磁性薄膜和异质结构的投资至关重要。带有超导的拆分磁铁，可变温度插入物和适用于此处的光学访问的干磁铁低温恒温器系统应用于投资自旋 - 钙符号传输现象，磁化动力学和磁化阻尼，磁光效应和旋转效应和自旋波动效应以及磁场强度，磁场强度，磁场强度，磁场强度，磁场强度，磁场强度和温度的功能。该系统的一个关键特征是封闭的（“干”）冷却电路，这使得过时的低温液体重新填充，因此可以在几天甚至几周内进行不间断的，高度敏感的测量。系统的第二个关键特征是能够将整个样品杆自动绕垂直低温恒温器轴自动旋转。这就是水平磁场相对于样品的方向，可以通过计算机控制进行远程调整。这样，对于给定的恒定磁场幅度，可以系统地记录“依赖角度”的测量数据（即，数据与样品和磁场之间的角度的函数）可以是系统地，可重复记录的。在此将样品牢固地安装在可旋转的样品杆上。因此，它可以以最佳的方式进行热稳定并进行电 - 电到电 - 计划高度敏感的运输和波动实验以及宽带自旋动力学测量值的重要先决条件。最后但并非最不重要的一点是，Windows在水平平面中提供了对样品的光学访问，并平行且垂直于磁场。除了磁光实验外，这还可以通过聚焦激光辐射产生局部温度梯度。总体而言，因此，此处适用的磁铁低温恒温器系统非常适合我们当前和计划的研究工作，例如，用于旋转 - 循环特征现象的定量投资，例如异常大厅（异常大厅）和Nernst效应，以及在不同的晶体和跨晶体典型的磁性磁场，跨度或抗铁磁性薄膜中，跨度或抗铁磁性薄膜，以及跨度的型号，或跨度型晶体的镜头，或者是摩根式的磁性镜头，或者过渡，或磁动力学和磁各向异性的研究。