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Sub-Kelvin ac magnetic susceptometry

机译:亚开尔文交流磁化法

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摘要

Designing an apparatus for experiments that operate deep into the milliKelvin regime requires a careful selection of materials and construction techniques, and often entails balancing mutually contradictory requirements. In the case of magnetic susceptibility measurements, this involves choosing materials that realize both high thermal conductivity for good heat sinking and low electrical conductivity for minimal eddy-current heating. A coil mounting system with a completely nonmetallic construction, achieved through the use of a sapphire skeleton and a machined carbon-fiber body, resolves this dilemma. This system permits the use of large ac magnetic field amplitudes at kHz frequencies and above, opening the door to studies of the nonlinear dynamics of a wide variety of magnetic systems that were previously inaccessible.
机译:设计用于在毫开尔文体制下进行的实验的设备需要仔细选择材料和构造技术,并且通常需要平衡相互矛盾的要求。在磁化率测量的情况下,这涉及选择既要实现良好的散热性又要实现高导热率的材料,而要实现最小的涡流加热则要实现低电导率的材料。通过使用蓝宝石骨架和机加工碳纤维主体,实现了具有完全非金属结构的线圈安装系统,解决了这一难题。该系统允许在kHz频率及更高频率下使用较大的交流磁场幅度,这为研究以前无法获得的各种磁性系统的非线性动力学打开了大门。

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