Post-doctoral Position Ptychography - HERMES

Post-doctoral Position Ptychography - HERMES

SOLEIL Synchrotron

Paris, France

HERMES is developing a new soft X-ray microscopy approach (Ptychography) that enables to reach ultimate spatial resolution well bellow 10nm. The resolution in standard X-ray microscopes is limited by the focusing element, e.g. Fresnel Zone Plates (FZP), and stays in the range of 20 nm for highly efficient zone plates. Diffraction imaging techniques with the use of coherent X-ray radiation potentially can achieve wavelength-limited resolution solving so-called “phase problem”. During the last years with steadily increasing computing power, which is necessary for the iterative image reconstructions, these methods became highly efficient for high-resolution imaging. Ptychography is the combination of diffraction imaging and scanning transmission microscopy that provides images of extended sample areas utilizing iterative reconstruction algorithm, which gives phase and amplitude information from the studied specimens. The main purpose of this postdoctoral position is the realization of ptychographic imaging on the samples with different scattering power, as well as the investigation and improvement of the microscopic potential of this method in detailed comparison with conventional STXM imaging.

Missions

The PostDoc position will be open starting from the first half of 2019. The successful candidate will be in charge of the development, implementation and commissioning of the Ptychography setup on HERMES beamline under the supervision of the beamline responsible. Once the setup validated, the candidate will participate in supporting external users of the Ptychography setup (both academic and industrial) in order to meet the anticipated increased demand. This involves both operating the Ptychography setup and data processing.

Once the Ptychography setup validated the successful candidate will be in charge of the development of high-resolution XMCD Ptychography measurements for studying nanomagnetic materials in close collaborations with our beamline partners:

  • Study of the magnetosom chains formation in magnetactic bacteria: Magnetic bacteria play an important role in the biomineralisation process especially in aquatic environment. These bacteria form magnetic nanoparticles with strong magnetic dipoles that tend to align the cell with earth magnetic field. High resolution XMCD Ptychography will be employed to evidence the close correlation between the flagella and the nanoparticles magnetic moment in order to demonstrate it influence on the preferential magnetosom mobility. This project will be performed in close collaboration with Prof. A. Hitchcock (McMaster University – Canada);
  • Observation of sub-10nm Skyrmion: This project will be developed in close collaboration with O. Boulle (CEA-LETI, Grenoble). In this study we propose to use magnetic skyrmion as the building block of completely disruptive logic-in-memory technologies that intrinsically merges high density non-volatile storage memories and logic operations, with expected very large gain in terms of power consumption, computing performance, data density and cost. This will be made possible by leveraging the nm scale, topological protected, low power and fast manipulation of magnetic skyrmion;
  • Magnetic domain and domain wall structure in nanotubes and nanowires: This project is aiming at developing non-volatile tridimensional magnetic memories on the basis of the race-track concept, originally proposed by IBM. The main idea behind this concept is the realisation of dense 3D array of nanowires and nanotubes along which the magnetic domains walls can propagate using the so-called spin-torque transfer. The main purpose of this study will be the investigation of the domain wall structure and motion under external excitation (magnetic field or current injection). This work will be performed in collaboration with O. Fruchart (I. Néel, Grenoble).

Beside of this, the candidate will also participate to the general operation of the beamline. He/she will take part to the users support program as well as in the beamline preparation, development and maintenance.

Finally the candidate may propose their own research topic compatible with the techniques proposed by the beamline and the scientific themes addressed.

Qualifications and Expertise

The candidate should hold a Ph.D. or equivalent degree in Physics, Chemistry, Materials Science or a related discipline. Previous experience in a synchrotron radiation center will be much more appreciated.

The following aspects will be considered with the greatest attention:

  • Expertise in synchrotron methods;
  • Proven knowledge of X-ray microscopy, coherent diffraction and related methods;
  • Capability in developing and managing complex experimental equipment;
  • Demonstrated experience in organizing the activity at shared experimental facilities;
  • Good expertise in programming (Python, C++…).

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© EuroJobsites 2019

EuroJobsites is a UK registered company number: 4694396 VAT number: GB 880 9055 04

Registered address: EuroJobsites Ltd, Unit 8, Kingsmill Business Park, Kingston Upon Thames, London, KT1 3GZ, United Kingdom

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