HREELM - High resolution electron energy loss microscopy – 4
We are delighted to announce that the HREELM project is one of this year’s laureats of the SESAME 2024 call, supported by the Ile-de-France region
The aim
Imaging for the first time the surface vibrational states with nanometric spatial resolution
This will be done by full filed imaging of loss energy electron energy losses in real and reciprocal space at high spatial (15 nm) spectral (5 meV) and wave-vector (40 cm-1) resolutions.
More information can be found in the project section !
Santiago’s PhD defense !
Santiago defended his PhD and answered brillantly the jury members questions (from left to right : Jérôme Wolfman, Eugénie Martinez, Maria Christine Richter, Mathieu Frégneaux, Nick Barrett and Bruno Domenichini)
Once again, congratulations !
Kale Somnath Dadabhau arrival
Dr. Kale Somnath Dadabhau completed his PhD at the Indian Institute of Science Education and Research (IISER), Berhampur, India, where his research focused on investigating the effects of size and boundary conditions in ferroelectric thin films and tunnel junctions. Before his doctoral studies, he earned a Master’s degree in Physics from the Department of Physics, Savitribai Phule Pune University, India. Dr. Kale previously worked as a postdoctoral researcher at IISER Berhampur, where he focused on multiferroic tunnel junctions for next-generation non-volatile memories. His research interests include Material science, nanoelectronics, and the application of thin films in memory devices and energy-efficient technologies. He has received several awards, including the IEEE and SERB Travel Awards, as well as the Sanjay Shewale Prize for academic excellence.
He has recently joined LENSIS as a postdoctoral researcher to work on the project Ferro4EdgeAI, “Scalable Ferroelectric-Based Accelerators for Energy Efficient Edge AI.” This project focuses on developing ultra-low-power, scalable edge accelerators for artificial intelligence, incorporating a memory-augmented neural network based on low-cost, high-density, multi-level, Back End of Line (BEoL) integrated ferroelectric (FE) technology. The project is conducted in collaboration with Horizon Europe CL4, Leti, NaMLab, INL, TU Delft, STMicroelectronics, FMC, and SynSense.
NVMTS conference !
“During my poster presentation on "Polarization Dependent Oxygen Vacancy Distribution in Ferroelectric Hf₀.₅Zr₀.₅O₂ Capacitors," I engaged in meaningful discussions with notable experts in the field, including Prof. Hwang, Prof. Jeon and Dr. Mueller. Key questions arose during these interactions: Prof. Datta inquired about the mechanisms behind oxygen vacancy migration under varying polarization conditions, which led me to explain the influence of built-in electric fields. I gained valuable insights into several fundamental physics concepts. I learned about the dynamics of oxygen vacancies, revealing how their migration affects device reliability and functionality. I explored energy barriers associated with vacancy movement and the significant role of built-in electric fields in shaping vacancy distribution. This understanding highlighted the challenges related to wake-up and fatigue effects in ferroelectric devices. Additionally, discussions on optimizing HZO materials reinforced the importance of precise fabrication techniques and their implications for next-generation memory technologies.” (Dr. Gunjan Yadav)
We want to acknowledge the PEPR Diadem MicroElec project for the funding.
Spring-8 beamtime !
Successful HAXPES beamtime for Gunjan Yadav’s project on the BL09XU beamline of the Spring-8 synchrotron in Japan. Many thanks to Akira Yasui, Seo Okkyun, Jiagi Tang and Ibrahima Gueye for their help and support! Hopefully we have some nice results on the oxygen vacancy depth profiles in 6 nm HZO capacitors made in CEA/LETI and cycled at different voltages.
Work supported by the MicroElec project of the PEPR Diadem and by the Horizon Europe Ferro4EdgeAI.
Here Gunjan, Ibrahima and Seo in front of the wide angle HAXPES analyzer.
EunJin Koh arrival
Eunjin Koh just recently joined the LENSIS. She studied physics for bachelor and material engineering for master, in Sungkyunkwan University in Suwon, South Korea. She is going to investigate hafnium based thin films using XPS.
Her thesis is funded by the Horizon Europe project Ferro4EdgeAI (https://www.ferro4edgeai.eu/)
Luis Azevedo Antunes arrival
Luis Azevedo Antunes earned his bachelor’s degree in Physical Engineering and a master’s degree in Micro- and Nanotechnology from the Munich University of Applied Sciences. During his master’s program, he spent a semester abroad at Clemson University in the USA. He received the Georg-Simon-Ohm Award for his master’s thesis titled “The Effects of Oxygen Defects on the Formation of the Ferroelectric Phase in Doped HfO2, Based on Density Functional Calculations.”, providing the motivation to pursue a Ph.D. in the same field. He is part of the team which secured second place at the Merck Innovation Cup for their work on neuro-inspired AI inference acceleration.
Luis has recently joined LENSIS as an external collaborator from the Munich University of Applied Sciences, a project partner of the D3PO initiative, “Dopant and Defect Physics for Device Optimization in Hafnium Oxide-based Devices.” This bilateral ANR-DFG project is in collaboration with CEA/LETI (Grenoble) and NaMLab (Dresden).
New artcile published on APL !
We are happy to announce that our work have been recently published on Applied Physics Letters. This article is entitled “Oxygen vacancy engineering in Si-doped, HfO2 ferroelectric capacitors using Ti oxygen scavenging layers”.
https://doi.org/10.1063/5.0205142
EDTM Conference
As part of our new partnership with Taiwan's National Yang Ming Chiao Tung University, Dr Sourav De presented a "Perspective Roadmap of Advanced HfO2-based Ferroelectric Field Effect Transistors" at the 8th Electron Devices Technology & Manufacturing Conference (EDTM) in Bangalore, India. You can find all the details on the publication section or directly here: https://doi.org/10.1109/EDTM58488.2024.10511366
New article published on PRL !
We are happy to announce that our work have been recently published on Physical Review Letters. This article is entitled “Ferroelastic Twin Angles at the Surface of CaTiO3 Quantified by Photoemission Electron Microscopy”. This article deals with Gregoire Magagnin PhD’s work in the team.
DIADEM WEBSITE
The new PEPR DIADEM website has just been released. In our team, this concerns Gunjan Yadav's postdoctoral work on the Microelec project: High throughput heterostructures elaboration and characterization for microelectronic applications.
Check out the different information here : https://www.pepr-diadem.fr/le-pepr-diadem/
Adityanarayan Pandey arrival
Dr Adityanarayan Pandey has done graduation and post-graduation from Mumbai University in Physics. He completed PhD in Physics from RRCAT, Indore (University: Homi Bhabha National Institute, BARC, Mumbai) in 2018. For the doctoral thesis, he worked on electrical and magnetic properties of magnetic ion-doped relaxor ferroelectrics. Then, he joined IIT Bombay as postdoctoral fellow from 2019-2023 in Metallurgical Engineering and Materials Science and Electrical Engineering Department. He was working on piezoelectric and magnetoelectric 2-2 bilayer/trilayer thin films for actuator applications and HfO2 based nanoscale ferroelectrics and PCMO-based resistive memory for Neuromorphic applications
He has just joined LENSIS as a postdoctoral researcher to work on the project D3PO “Dopant and Defect Physics for Device Optimization for Hafnium Oxide based Devices”, a bilateral ANR-DFG project in collaboration with CEA/LETI (Grenoble) NaMLab (Dresden), Munich University Applied Sciences.
Electron gun for the HREELM Project !
We are pleased to announce that Kimball Physics have finished the new electron gun which will be integrated into the HREELM prototype (https://anr.fr/Project-ANR-14-CE35-0019, we can also find details about the HREELM project in the Projects section). This tour de force of ultra-high vacuum, electron optics engineering should allow the production of highly monochromatic electrons for imaging surface vibrational states (collaboration with Daniel Comparat Laboratoire Aimé Cotton and Lionel Amiaud ISMO). The electron gun was realized thanks to a Labex NanoSaclay & PALM innovation project and internal funding from the CEA.
New open positions !
Two new positions have just been opened at LENSIS as part of the Ferro4edge project (1 postdoc and 1 PhD). Check out the "open positions" section, if you're interested !
Kick-Off du projet MicroElec
On November 30th, the MicroElec project was launched in front of ANR members. The aim of this project is a high throughput heterostructures elaboration and characterization for microelectronic applications. In our laboratory, we will perform HAXPES & PEEM analysis of multiple FeCAPs with AI-assisted image processing using new operando sample holder & high intensity, focused X-ray source (MicroElec funded). Gunjan Yadav already worked on this topic since end of August as a postdoctoral.
Vineeta Yadav arrival
Au LENSIS nous avons le plaisir d'accueillir Vineeta YADAV pour une thèse dans le cadre du PEPR électronique.
Vineeta Yadav has done her B. Sc. (Hons.) in Physics from University of Delhi and M. Sc. in Physics from Delhi Technological University, Delhi, India. She will be working in the LENSIS as PhD student on the topic “Hafnium Oxide Ferroelectric Films: from fundamental understanding to optimized low power device Integration”.
Lucia Perez Ramirez arrival
We are pleased to welcome to the LENSIS team Lucia Perez Ramirez as a permanent scientist:
Lucia Perez Ramirez earned her PhD in Physical Chemistry at LCPMR/Sorbonne University under the supervision of Jean-Jacques Gallet, where she studied the electronic structure of interfaces using several operando XPS techniques. She pursued her activity with a first postdoctoral experience at Synchrotron SOLEIL, where she worked on the development of advanced characterization techniques for the study of all-solid-state batteries. She was then appointed as scientific data engineer, in the context of the BIG-MAP European project, for the creation of data aggregation and semi-automatic analysis tools mainly for XAS and hyperspectral imaging experiments.
Gunjan Yadav arrival
Nous avons le plaisir d’accueillir Gunjan Yadav en postdoc pendant deux ans sur le projet ciblé MicroElec du PEPR Diadem :
Gunjan Yadav did her PhD from University of Delhi, India. She joined as a postdoctoral researcher on the project titled “High throughput heterostructures elaboration and characterization for microelectronic applications”
JNSPE 2023 conference in Sofia-Antibolis
Success of the JNSPE (Journées Nationales des Spectroscopies de PhotoEmission) conference in Sofia-Antibolis, France. More than 100 participants, 26 oral presentations, 4 invited presentations, 33 posters and 2 contributions from our LENSIS lab (Santiago and Tom).
Santiago had the opportunity to give an oral presentation entitled "Interface Control Layer in BaγSr1-γTiO3 Based Varactors for 5G technology" on his research work during his first 1 year and half of his PhD.
Tom was able to present his bibliographical advances as well as his future laboratory or synchrotron experiments during several poster sessions. He presented a poster entitled "XPS and HAXPES characterisation of Front-End of the Line (FeOL) Ferroelectric Field Effect Transistor FeFET". This project is a collaboration with STMicroelectronics.
Conference Website : https://www.jnspe.fr/
Kick-Off du projet BioElectronPhoton
On May 25th, the BioElectronPhoton project was launched in front of ANR members, as part of the electronics PEPR. In our laboratory, this will result in a thesis. We will study hafnia based materials for hybrid materials systems OxRRAM/FeRAM. Vineeta Yadav will start her thesis on the subject in October.
Tom Iung arrival
New PhD student Tom IUNG
Tom IUNG commence sa thèse cifre au LENSIS, « Caractérisation du champ interne dans les matériaux ferroélectriques, application aux transistors de type FeFET», dans le cadre d’une collaboration avec Mickael Gros-Jean (ST Microelectronics, Crolles).
D3PO
Dopant and Defect Physics for Device Optimization for Hafnium Oxide based Devices
The project is a Franco-German collaboration between the CEA, NaMLAb (Dresden) and the Technische Hochschule München, jointly funded by the ANR and the DFG.
Featured APL article on field cycling
Featured article from our LENSIS lab on Oxygen vacancy concentration as a function of cycling and polarization state in TiN/Hf0.5Zr0.5O2/TiN ferroelectric capacitors studied by x-ray photoemission electron microscopy
Link here : https://doi.org/10.1063/5.0093125
JNSPE conference in Dijon
Success of the JNSPE (Journées Nationales des Spectroscopies de PhotoEmission) conference in Dijon, France. 120 participants, 34 oral presentations, 5 invited presentations and 3 contributions from our LENSIS lab (Anthony, Santiago and Wassim).
Conference Website : https://fr-spe.cnrs.fr/jnspe-2022/
Kerisha Williams
Kerisha Williams has returned to GeorgiaTech to continue her PhD work after spending 6 months with us doing XPS and SEM on her PMN-PT sol-gel films. Some high quality samples as can be seen from a typical Pb 4f spectrum shown here. Kerisha also did domain writing and characterization of HfZrO2 films and looked at the domain contrast in BaTiO3 single crystal surfaces using SEM.
We wish Kerisha the best of luck for final part of her thesis with Prof. Nazanin Bassiri Gharb and look forward, hopefully to some HAXPES beamtime in the near future.