Universiteit Leiden

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Aarts Lab - Magnetic and Superconducting Materials

In the Aarts lab we combine or structure materials, mostly in thin film form, in such a way that the hybrid has different and novel properties or functionalities.

A good example is our work on combinations of superconductors and ferromagnets. It turns out to be possible to induce superconductivity in a ferromagnet over very long length scales using the mechanism of ‘odd-frequency s-wave triplet formation’. For this we concentrate  on the growth and use of CrO2, which is a ferromagnet with full spin polarization, as a platform for various devices. Using selective area growth, we can fabricate nanowires for various types of experiments [1]. In this part of the group we also work on a p-wave triplet superconductor, Sr2RuO4. In a collaboration with Kyoto University (Prof. Y. Maeno) we try to find signatures of half-flux quanta in micron-sized rings.

[1] A. Singh, C. Jansen, K. Lahabi, and J. Aarts (2016) High-Quality CrO2 Nanowires for Dissipation-less Spintronics, Phys. Rev. X, 6, 041012.

Another research line involves complex oxides. We are currenty studying the question whether the electron gas which forms at the interface between the two band insulators can be made magnetic. We have worked on SrTiO3 / LaAlObefore, currently we are working on LaTiO3 in a collaboration with Twente University, where samples are fabricated with Pulsed Laser Deposition. We can also make samples by sputtering, for which we just installed a new off-axis sputtering system.

There are also several smaller projects which involve the fabrication of graphene for use in other hybrid structures, or work on particular superconducting properties of various materials.

The group has extensive facilities for thin film deposition (sputtering), for sub-micron structuring (electron beam patterning), for characterization (Xray, AFM), and for low-temperature measurements.

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