Next colloquium
Next colloquium
Wednesday, 21 November at 3 pm
Leo Molina-Luna
Electric field in situ TEM of functional materials: towards atomic-resolution operando nanoscopy
Abstract
Recent advances in microelectromechanical systems (MEMS) based chips for in situ transmission electron microscopy are opening exciting new avenues in nanoscale research. The capability to perform current-voltage measurements while simultaneously analyzing the corresponding structural, chemical or even electronic structure changes during device operation would be a major breakthrough in the field of nanoelectronics and beyond. We aim to directly link the atomic structure to the physical properties under working or so called operando conditions. Shown in figure 1 is an electro-thermal chip sample carrier that allows the combined application of an electrical bias with a thermal gradient directly inside a transmission electron microscope [2]. With this setup, in situ atomic-resolution experiments on functional materials systems and electronic devices are possible. This talk will address the challenges, recent advances and possibilities of the field. Furthermore, I will present our efforts in systems that are relevant for random access memory devices (RRAM) [1], tunable microwave applications and nanomaterials with switchable polarization that are indispensable in memory devices, sensors, actuators, and transducers [2].
References
[1] A. Zintler et al., “FIB based fabrication of an operative Pt/HfO2/TiN device for resistive switching inside a transmission electron microscope,” Ultramicroscopy, vol. 181, no. Supplement C, pp. 144–149, Oct. 2017.
[2] L. Molina-Luna et al., “Enabling nanoscale flexoelectricity at extreme temperature by tuning cation diffusion,” Nature Commun., vol. 9, no. 1, Dec. 2018.
Institute for Applied Geosciences
Technische Universität Darmstadt
Figure 1. Electro-thermal chip sample carrier for in situ transmission electron microscopy. (a) Schematics of the electro-thermal chip, including the set of biasing electrodes surrounded by the encapsulated microheater colored in green that is temperature controlled by Joule heating. (b) Corresponding simulated temperature distribution profile generated by the microheater. (c) Magnified view of the biasing wires region, showing a close-up of the 20 nm thick electron transparent window and the four surrounding biasing wires. The green plane represents the cross-section where the electric field magnitude is plotted. (d) Finite element simulation of local electric field magnitude and the electric field lines over the cross-sectional plane indicated in (c). A nanoparticle was placed in the window area between the electrodes for modeling.
Colloquia 2018/19
Colloquia 2018/19
2018
Date |
Speaker |
Title |
|---|---|---|
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19/09/2018 |
Daniele Faccio (Glasgow) |
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26/09/2018 |
Steve Barnett (Glasgow) |
|
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10/10/2018 |
Daniel J. Smith (Glasgow) |
|
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24/10/2018 |
Laura Nuttall (Portsmouth) |
|
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7/11/2018 |
Ilja Gerhardt (MPI-FKF Stuttgart) |
Polarization entangled photon pairs from a single molecule |
|
21/11/2018 |
Leo Molina-Luna (TU Darmstadt) |
Electric field in situ TEM of functional materials: towards atomic-resolution operando nanoscopy |
|
5/12/2018 |
Christian Bonato (Heriot-Watt) |
Quantum technology with single spins |
2019
Date |
Speaker |
Title |
|---|---|---|
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16/01/2019 |
Sally Jordan (Open University) |
tba |
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23/01/2019 |
Ed Daw (Sheffield) |
Hunting for axions with ADMX |
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06/02/2019 |
Viv Kendon (Durham) |
Computational quantum walks with cooling |
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20/02/2019 |
Lily Asquith (Sussex) |
tba |
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6/03/2019 |
Susan Smith (ATLAS) |
tba |
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20/03/2019 |
tba |
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17/4/2019 |
Sneha Malde (Oxford) |
tba |
Wednesdays 3-4 pm
Room 257, Kelvin Building (unless otherwise stated)
Coffee and doughnuts available after the colloquium
All welcome!
Coordinated with the Strathclyde Physics Colloquia
