Spintronic samples design and electron optics for in operando Magnetic imaging

Published : 22 October 2019

Electron Holography is an advanced technique of Transmission Electron Microscopy that consists in reconstructing the full electron wave to access its phase. The phase of an electron wave is modulated by the presence of electro-magnetic fields that may be quantitatively mapped, once the phase is obtained. Beyond the possibility of describing magnetism (and more particularly micromagnetic objects such as domain walls or vortices) at the nanometer scale, it is now of fundamental importance to observe real devices (Magnetic Random Access Memories as a single example among others) during their operation (in operando). We thus need to prepare existing nano-devices for being able to observe them in a TEM that require electron transparency (below 100 nm thickness) still preserving their initial functions being addressable within the TEM. Moreover the possibility of quickly changing the physical state of the samples requires the capacity to handle and understand dynamical imaging via a continuously increasing set of images that need to be automatically acquired and numerically processed.

This internship will offer an important background and know how on nanoscale characterization, nanofabrication tools and data processing, thus enabling to discover various aspects of scientific research. The field of spintronics associated to such method offers the opportunity to understand and tailor an very broad panorama of physical phenomena in condensed matter, such as spin-orbit effects, Dzyaloshinskii-Moriya interactions and other interfacial effects.

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