Research Stays Abroad

  Visiting period:

2019

Visiting institution:

DTU in Denmark, Lyngby near Copenhagen

Visiting scientists:

Prof. Hansen

 

For my research stay abroad, I stayed at the DTU in Denmark, Lyngby near Copenhagen. 

I was staying in the Department of Applied Mathematics and Computer Science in the Section for Scientific Computing under the supervision of Prof. Hansen.

I was dealing with the inverse computation for possible imaging systems for the project B7. I was provided with an easy to use toolbox for efficient computation of the inverse solution under given constraints. With this toolbox, the inversion of large datasets was possible in a short amount of time, which enabled the comparison between different imaging system geometries. I derived possible geometries for an imaging system that could potentially work for 3D imaging for the B7 project.  

During my research stay, I enjoyed the working surroundings and all the colleagues. From time to time we had board game sessions after work and played until past 10 pm. The food in the cafeteria was great and the summer in Denmark was very warm and I enjoyed the nice weather during the time of my stay.

Each week there was a talk from the members of the group, explaining their work. It was very interesting to hear about other imaging procedures and the approaches with which the models were investigated.

My research stay formed the basis for further research and widened my understanding of other fields that deal with imaging and inverse problems.

 

  Visiting period:

mid-November to mid-December 2017

Visiting institution:

Institute of Mechanics and Mechatronics of the Vienna University of Technology, Austria

Visiting scientists:

Prof. Kaltenbacher

 

From mid-November to mid-December 2017, I spent my research stay abroad in Vienna, Austria, where I had the opportunity to work at the Institute of Mechanics and Mechatronics of the Vienna University of Technology in the group of Prof. Kaltenbacher focusing on technical acoustics [1]. The group has a lot of experience in modelling and optimization of MEMS speakers, acoustic insulation, e.g. in the automotive area, and multi-physic systems such as surface acoustic wave (SAW) sensors. They are well experienced in developing FEM models due to their development of their own Finite Element simulation tool CFS++ (Coupled Field Simulation).

The exchange was very helpful to validate my complex SAW model with anisotropic material properties. The group provided access to their FEM tool and supported me in transferring my existing COMSOL SAW model to CFS++, so that I was able to confirm my COMSOL model.

One of the main objectives was to verify the rotated anisotropic st-cut quartz material model. Different simulation tools are using various coordinate system definitions and the definition of the rotation angle of the crystal itself is inconsistent in the literature. Hence, it was very helpful to implement the tensor rotation in both FEM tools in order to approve the used orientation and tensor rotation implementation.

A particular challenge was to implement perfectly matched layers (PML). These layers are necessary to prevent undesired reflections of the propagating mechanical waves at the model boundaries. During my stay, we expanded the PML implementation in their CFS++ to mechanical waves and my work resulted in a test case for that implementation.
Besides research, I was able to find some time for sightseeing in Vienna, i.e. for famous Schönbrunn Palace, Belvedere Palace, Hofburg etc. In addition, I was included into group activities, i.e. visiting Christmas markets.

I would like to thank Prof. Kaltenbacher for the opportunity to visit his work group and learn from their experience and Dr. Toth for his excellent support. I also would like to thank the German Research Foundation (DFG) for funding this research stay as part of the CRC 1261. 

 

  Visiting period:

11.04.2018-29.06.2018

Visiting institution:

University of South Australia, Adelaide, Australia

Visiting scientists:

Benjamin Thierry

 

From mid of April to end of June, I did my external research stay in Adelaide. Here I visited the NanoBioEngineering group of Benjamin Thierry at the Future Industries Institute at the University of South Australia in Adelaide. The group is interdisciplinary and focusses on the development and implementation of novel cancer biodiagnostic and prognostic technologies. There is a lot of work going on dealing with nanoparticles and microfluidic devices. In both areas I learned useful things for my work in the CRC 1261. 

I really enjoyed my stay in this group of nice people from all over the world. Everybody was extremely helpful and open-minded. Besides this, I really liked the meetings with Benjamin, which were very inspiring. Sometimes I missed having lunch together with the group but this was compensated with several after work activities with the whole group and single group members. 

During my last week in Australia I visited the Nanomedicine Conference in Sydney. A nice experience with many interesting talks about nanoparticles in biological applications and biosensors.

In Adelaide I lived most of the time in a very nice AirBnB Apartment. My hosts were from Vietnam and I had the possibility to taste many new flavours and spices. In the first month the weather was very nice. On my first weekend in Australia my hosts took me to the beach where we collected a lot of clams. Towards the end of my stay the weather was getting colder every day like it is usual in autumn downunder. This was the time were all the fruits in the beautiful garden were ripe and it was possible to have a glass of self-made orange juice in the morning. The only drawback was that the orange juice was nearly frozen since it was close to one degree. Briefly I would recommend everybody to go to Australia but If you will ever travel to South Australia during the summer in Europe pack your warm stuff since it is freezing cold – even inside the houses.

I would like to thank the DFG for funding this research stay through CRC 1261.

 

  Visiting period:

20.08.2018 – 28.09.2018 (6 weeks)

Visiting institution:

FEMTO-ST Institute, Besançon, France

Visiting scientists:

Enrico Rubiola, Jean-Michel Friedt

 

For my research stay abroad I visited the Institute FEMTO-ST in Besançon, France, which is a joint CNRS-University Bourgogne Franche-Comté research institute that carries out both fundamental and applied research in many fields of physics including optics, acoustics, robotics, automatics, time-frequency metrology, mechanics, and energy storage. For 6 weeks I have been working with the Time & Frequency Department under the supervision of Enrico Rubiola and Jean-Michel Friedt. They are outstanding experts in the fields of phase noise, surface acoustic wave (SAW) sensors, oscillators, and low noise instrumentation. Together with them I was able to further improve the noise floor of the readout electronics for our SAW magnetic field sensors as well as to develop an analytical noise model for the various types of readout systems. More particularly, a theory has been developed and verified by various measurements which allows to derive the ultimate limit of detection in both open-loop and closed-loop SAW sensor systems. So far, two journal papers have been written based on the work during the research stay. Because several further ideas emerged, this fruitful collaboration is still ongoing. I would like to take this opportunity to gratefully thank my hosts once again for their excellent support both during my stay and also afterwards. In addition, I also want to thank the German Research Foundation (DFG) for funding this research stay as part of the CRC 1261.

 

  Visiting period: 15.01.2018 - 15.02.2018 (1 months)
Visiting institution:

Institute Neél - CNRS

Hosting scientist:

Stefania Pizzini

 

For my research stay I decided to visit the Institute Neél – CNRS, more specifically the group of Micro & Nano Magnetism (MNM) headed by Stefania Pizzini. With 450 employees, the institute Néel is one of the leading institutions for research in condensed matter physics. The institute also makes a high amount of contribution into magnetism and spintronics, which is also the main research topic of the MNM group. 

Upon arrival, the group quickly integrated me into their working environment and helped me to understand, guide and teach their vastly researched topic, which is domain wall dynamics. During my stay, I learned about the dynamics of domain walls and domain wall motion manipulated by current pulses through spin transfer torque (STT). Additionally, I had the chance to collaborate with researchers from Spintec and gained much insight into spin related phenomena (many thanks to Laurent and Toshiki). The whole visit provided me with much needed knowledge and expertise that I will need for my PhD as for my future career path. The newly gained experience and insights will be a benefit for the future work within the project SFB 1261 in the analysis of domain wall behavior in the magnetostrictive layers of the sensors. Furthermore, with the work and obtained results during my stay in Grenoble a joint work publication is expected. With this, I would like to thank everyone that I had the pleasure meeting and working with, especially Jan and Stefania.

The city of Grenoble by itself is a really interesting place. Secluded   between mountains and wrapped in the spirit of the Alps the city provides beautiful sceneries and various possibilities of activities in nature. The city by itself with its somewhat historical look gives the person living there a feeling of calmness, however during the day trams full of people running every some minutes shows the hustle and bustle of the dynamical life there. Grenoble is a relatively large city providing many versatile infrastructure as also multiple shopping possibilities around the city center as well as on the outskirts of it. People there are friendly and eager to help, if a visiting person looks like a lost tourist. The city has its fair share of international character however, I would recommend knowing at least some French words before visiting Grenoble.

In conclusion, the research stay was a success and provided a very positive outcome for me on a personal and professional level. For the other participants of the SFB 1261 I would definitely recommend Institute Neél and Grenoble as a wonderful possibility for an external research stay.

I gratefully thank the DFG as part of the CRC 1261 for giving me the opportunity through their funding to conduct this external research stay.

Matic Klug

  Visiting period: 24.10.2017 – 18.12.2017 (2 months)
Visiting institution: University of California, San Diego
Visiting scientists: Prof. Oleg Shpyrko

 

My stay abroad brought me to San Diego, right next to the Pacific Ocean and Mexico. My host was Prof. Oleg Shpyrko, he is a physicist and a leading scientist in coherent imaging techniques at synchrotron sources. He is a Professor and head of a group at the UCSD, University of California, San Diego.I arrived in San Diego on the 25th of October. It felt like the warmest day of the whole year for me and was, like all the other days in the next two months, sunny. The first people I got to know were my landlord and roommates. During my time in Pacific beach, one of many neighborhoods in San Diego, I got to know them quite well and we had a lot of fun and a great time. The first place I went was the beach. The beach was about 5 minutes away from the house and I took advantage of the proximity many times during my stay. The university was a 40 minutes bus ride away, along the scenic drive. As the name implies the way to the university has a beautiful view over the coastline of north San Diego. The campus of the UCSD is huge and you have many places to go and discover, for example the Geisel library known from the Inception movie. On the other hand, it feels local and small, and all the people are helpful and nice.

On my first day at the university, I had to do a lot of paper work and sign many documents. The American administrations love their paper work. After this first part, I got all my keys and cards and was a member/student of the UCSD. In the afternoon, I met my colleagues. They were from all over the world and we had a nice time together. I profited a lot from their knowledge about synchrotron sources, especially about coherent imaging techniques. Moreover, how to analyze and interpret the acquired measurements. 

My everyday life at the university wasn’t that different from my well known work back in Kiel. We worked a huge part of the day at the computer and had from time to time a nice chat. On the other hand it differed. For example, the group has no laboratory of their own and I had to ask other scientist, to have a look at my sample and check them. And of cause, I had to learn about the new technique. I read and learn a lot, like in the beginning of the PhD phase. 

An important part of my stay in the USA was a trip to the APS near Chicago. A third generation synchrotron, where we performed a coherent imaging experiment on samples related to the CRC 1261.  Say what the samples were ZnO nanorods coated in gold with very special electrical and strain behaviour. This took place in cooperation with the Shpyrko group. DR. S. Hrkac accompanied me and guided me through the experiment and Ross harder the beamline scientist thought me how to use his instrument for my experiments as this was a new method for me. Thanks to their help, the experiment was a great success and we could visualize strain on nm length scales in the rods. The results are important for our SFB project A6 and most likely have a big influence on my own work. I am currently analyzing the data and aim to write a paper with the results this year.

In conclusion, I would encourage everybody to go to San Diego, enjoy this great city, the wonderful weather and this excellent university. I would like to thank the DFG for funding this research stay through CRC 1261.

 

Contact

sfb1261@tf.uni-kiel.de

Chairman:

Prof. Dr. Eckhard Quandt

Kiel University
Institute for Materials Science

 

Interner Server

 

CAU

Christian-Albrechts-Universität zu Kiel (CAU)

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D-24118 Kiel

UKSH

University Hospital Schleswig-Holstein, Campus Kiel (UKSH)

Arnold-Heller-Straße 3
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Fraunhofer Institute for Silicon Technology, Itzehoe (ISIT)

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IPN - Leibniz-Institut für die Pädagogik der Naturwissenschaften und Mathematik an der Universität Kiel

Olshausenstraße 62 
D-24118 Kiel

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