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PhD position on MacEtch based nanofabrication of high aspect ratio silicon nanowires with magnetic tips (P2205)


   Swiss Nanoscience Institute

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  Dr AB Baumgartner  No more applications being accepted  Funded PhD Project (Students Worldwide)

About the Project

The Swiss Nanoscience Institute (SNI) at the University of Basel invites highly motivated scientists to apply for the SNI PhD program in Nanoscience.

The position (your position):

We are looking for a motivated PhD student working in a highly competitive project:

With recent advances and new applications, metal assisted chemical etching (MacEtch) is the new frontier of non-plasma nanofabrication of silicon at extreme aspect ratios [1]. Depending on catalyst, substrate doping type, substrate crystal, etchant formulation, and etch additives, a careful process optimization seems to be the key for unprecedented nanostructuring. With a record nanowire (NW) aspect ratio of 10’000:1 in gas-phase, MacEtch of silicon is still lacking of a systematic investigation and a comprehensive model preventing its spreading as mass production for nanotechnology. Magnetic NWs have been used as transducers in a highly sensitive form of magnetic force microscopy (MFM), which is ideal for imaging subtle patterns of magnetization or current density. Such imaging can provide microscopic information about length scales, inhomogeneity and interactions especially in poorly understood 2D materials. Until now, however, a reliable fabrication process producing NW MFM probes with high mechanical and magnetic quality has not been developed. Here we propose to apply MacEtch for the production of NWs with magnetic tips and to use these probes in NW MFM for sensitive magnetic imaging. We will use the clean-room facilities at PSI, including cutting-edge lithographic capabilities and gas-MacEtch. The magnetic properties will be measured at at Univ. Basel with magnetic force microscopy. Bosting the nanofabrication capabilities will synergistically address different scientific applications enabling even new possibilities in several fields. High aspect ratio nanogratings are expected to improve the sensitivity of grating based X-ray interferometry, a technology PSI has been pioneering and currently one of the world-leading research institution. Fundamental studies about magnetism are on-going in the group at Univ. Basel. Among the nanostructures, magnetic NWs are attractive materials for various advanced technologies in sensing, data storage, spintronics, biomedicine, bio-interfaces and microwave devices, etc.

Requirements (your profile):

Candidates are required to have a MS degree in natural sciences, with a solid background relevant for the above topics. Prior experience in any of the mentioned techniques is a plus. We seek a scientifically ambitious individual who enjoys working in an interdisciplinary and collaborative environment on a highly competitive subject.

We offer:

  • Excellent scientific and social environment
  • Very competitive employment conditions
  • Membership in a very supportive and recognised community

The successful candidate will become a member of a very active research group at the physics department and of the Swiss Nanoscience Institute (SNI) PhD school with ~30 currently supported scientists. The SNI covers a wide variety of topics, including cutting edge quantum physics and chemistry, material science, nanotechnology, biochemistry, cell biology, or medical research.

Application / contact:

More information and the online application platform can be found at www.phd.nanoscience.ch. For questions please contact the head of the SNI PhD programme, Dr. Andreas Baumgartner ([Email Address Removed]), or directly the respective project leaders. The complete application has to be submitted before 31 December 2022. Please note that the decision to fill a given vacancy can be taken at any time from now.

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