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Post-doctoral position

Entreprise/Labo : IM2NP (AMU CNRS Marseille) / Marseille

Description :

As it was recently demonstrated by the INTEL OPTANETM memory technology, Phase-Change Materials (PCM) are the most promising materials for new generations of Non-Volatile Memories (NVM). This is the result of their ultra-high scalability and short programming times lying in between volatile DRAM and Flash non-volatile memories. As a result, PCMs offer the opportunity to achieve Storage Class Memory which are at the forefront in order to achieve innovative brain-inspired computing devices and neuromorphic circuits. The principle of operation of PCM memories is to switch reversibly the PCM between an amorphous and a crystalline phase by means of electrical pulses application inducing the local heating of the PCM. Reading the state (amorphous or crystalline) is based on the very large and unique resistivity contrast between the two phases. Nowadays, the most promising PCM to target embedded applications (mobiles, automotive, micro controllers…), i.e. requiring high stability under thermal stress, are multi-phased complex composition alloys GexSbyTez. The latter raise critical issues on the interplay between interfaces, composition, stresses or confinement and crystallization kinetics. The aim of this post-doctoral work is to contribute investigating the structural changes of these materials during heat treatment using advanced in situ characterization techniques (X-ray scattering using synchrotron radiation facilities and high-resolution transmission electron microscopy). In order to better understand the influences of geometry, interface and volume confinement on the crystallization mechanisms, thermally activated microstructural evolutions (nucleation and growth of crystalline phases, stress development and relaxation…) will be characterized at the nanoscopic scale. The in situ heating experiments in an aberration-corrected transmission electron microscope will be performed with specifically patterned structures using dedicated sample holder apparatus available in the MNO group. This work will be performed in strong partnership with the STMicroelectronics company.

Contact : Prof. Olivier Thomas , Prof. Michaël Texier

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