Termine

RF NEMS Magnetoelectric Sensors (Northeastern University, Boston)

18.06.2018 von 17:15 bis 18:00

Technische Fakultät, Gebäude D, Kaisterstraße 2, Aquarium

Abstract

The coexistence of electric polarization and magnetization in multiferroic materials provides great opportunities for realizing magnetoelectric coupling, including electric field control of magnetism, or vice versa, through a strain mediated magnetoelectric coupling in layered magnetic/ferroelectric multiferroic heterostructures [1-9]. Strong magnetoelectric coupling has been the enabling factor for different multiferroic devices, which however has been elusive, particularly at RF/microwave frequencies. In this presentation, I will cover the most recent progress on new integrated magnetoelectric materials, magnetoelectric NEMS (nanoelectromechanical system) based sensors and antennas. Specifically, we will introduce magnetoelectric multiferroic materials, and their applications in different devices, including: (1) novel ultra-compact RF NEMS acoustic magnetoelectric antennas immune from ground plane effect with < l0/100 in size, self-biased operation and potentially 1~2% voltage tunable operation frequency; and (2) ultra-sensitive RF NEMS magnetoelectric magnetometers with ultra-low noise of ~1pT/Hz1/2 at 10 Hz for DC and AC magnetic fields sensing. These novel magnetoelectric devices show great promise for applications in compact, lightweight and power efficient sensors and sensing systems, ultra-compact antennas and for radars, communication systems, biomedical devices, IoT, etc.

Reference: 1. N.X. Sun and G. Srinivasan, SPIN, 02, 1240004 (2012); 2. J. Lou, et al., Advanced Materials, 21, 4711 (2009); 3. J. Lou, et al. Appl. Phys. Lett. 94, 112508 (2009); 4. M. Liu, et al. Advanced Functional Materials, 21, 2593 (2011); 5. T. Nan, et al. Scientific Reports, 3, 1985 (2013); 6. M. Liu, et al. Advanced Materials, 25, 1435 (2013); 7. M. Liu, et al. Advanced Functional Materials, 19, 1826 (2009); 8. Ziyao Zhou, et al. Nature Communications, 6, 6082 (2015). 9. T. Nan, et al. Nature Comm. 8, 296 (2017).

Short Bio: Nian Sun is professor at the Electrical and Computer Engineering Department, Director of the W.M. Keck Laboratory for Integrated Ferroics, Northeastern University, Boston, and Thrust Leader of 2-D Multiferroics in the NSF ERC Transitional Applications of Nanoscale Multiferroic Systems (TANMS). He received his Ph.D. degree from Stanford University. Prior to joining Northeastern University, he was a Scientist at IBM and Hitachi Global Storage Technologies. Dr. Sun was the recipient of the NSF CAREER Award, ONR Young Investigator Award, the Søren Buus Outstanding Research Award, etc. His research interests include novel magnetic, ferroelectric and multiferroic materials, devices and subsystems. He has over 240 publications and over 20 patents and patent applications. One of his papers was selected as the “ten most outstanding full papers in the past decade (2001~2010) in Advanced Functional Materials”. Dr. Sun has given over 100 plenary or invited presentations and seminars in national and international conferences and universities. He is an editor of Sensors, and IEEE Transactions on Magnetics, and a fellow of the Institute of Physics, and of the Institution of Engineering and Technology.

Prof. Quandt

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tba, Iain Dunlop, Imperial College London

Particle Physics after the Higgs Discovery: Where do we go? (Prof. Dr. Thomas Mannel, Siegen)

26.06.2018 ab 16:15

Hans - Geiger - Hörsaal (LS13 - R.52) des Physikzentrums

Abstract

After the recent discovery of the Higgs boson the so-called Standard Model of particle physics has become a complete and mathematically consistent theory, which – at least in principle – could be valid up to extremely high energies. In this talk I will discuss, why research in particle physics is still well motivated, although the Higgs boson is discovered. I will consider on the one hand the theoretical problems of the standard model, on the other hand, I will discuss experimental hints, why the standard model cannot be the final theory of the fundamental interactions.

Referent: Prof. Dr. Thomas Mannel (Universität Siegen, Germany)

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To Catch a Thief, Dr. Giselher Herzer, Vacuumschmelze GmbH & Co. KG, Hanau

10.07.2018 ab 17:00

Technische Fakultät, Gebäude D, Kaisterstraße 2, Aquarium

Abstract

Retailers lose billions of Euros per year to shoplifters. Department store detectives and video cameras are therefore increasingly being assisted by electronic article surveillance (EAS). Hundred thousands of such systems are meanwhile installed and millions of disposable security labels are being produced on a daily base. Basically all EAS-systems operate on the same principle: Articles are affixed with security labels which, if not deactivated at the cash register, respond to electromagnetic fields generated from pedestals at the store's exits. The response is picked up by an antenna in the pedestals, thereby triggering an alarm. Today’s security labels are disposable items which are also used to secure inexpensive articles. Moreover, EAS labels are increasingly integrated directly into products or packaging during the manufacturing or packaging process. One major requirement therefore is that the labels are small and cheap. Further requirements are that the labels are reliably detectable and deactivatable and, as one of the major requests, that they cause no false alarms.

One of the most wide-spread EAS systems is based on magnetoelastic sensors which represent the latest and most sophisticated technology. The sensor element is a short magnetostrictive amorphous alloy ribbon which is housed in a small cavity such that it can vibrate freely. It is excited by magnetic field pulses to longitudinal, resonant vibrations. Once an exciting tone burst is over, the mechanical vibrations ring down exponentially over a time period of several milliseconds, hereby inducing a characteristic voltage in the receiver antenna while the exciting field is off. The detection electronics traces these echo voltages and triggers alarm if it recognizes the typical characteristics (like resonant frequency and ring-down time) of the resonator.

The talk surveys the physics behind magnetoelastic EAS labels and illustrates how to customize the sensor material by appropriate alloy design and thermal treatment.

http://sfb1261.de/index.php/en/events-en/talks-for-members/talks-for-members-2018

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Nanopharmaceuticals - (nano)partikuläre Darreichungsformen für den Respirationstrakt?!, Prof. Dr. Regine Scherließ (Antrittsvorlesung)

12.07.2018 von 15:00 bis 15:30

Großer Hörsaal Pharmazie, Gutenbergstraße 76

Abstract

"Nano" ist schon seit geraumer Zeit ein Schlagwort, das sowohl verführerisch klingt wie auch kritisch beäugt wird. Dabei werden Nanostrukturen in der Technik und Medizin nicht erst seit der "National Nano Initiative" des National Institute of Health (NIH) in den USA im Jahr 2000 untersucht und eingesetzt. Mit dem neuen Jahrtausend hat aber das öffentliche Interesse an "Nano" und die Verbreitung von Nanotechnologien deutlich zugenommen. Im Rahmen der Vorlesung wird beleuchtet, was "Nano" im (pharmazeutisch-)technologischen Zusammenhang bedeutet und welche besonderen Eigenschaften Nanostrukturen mit sich bringen können. Nanotechnologien finden sich schon in einer Reihe von Arzneimitteln, den "Nanopharmaceuticals", wieder, wobei diese meist für die parenterale oder perorale Gabe gedacht sind. Im Respirationstrakt werden Nanopartikel häufig zunächst mit toxikologischen Überlegungen (Feinstaub, Rußpartikel) in Verbindung gebracht – aber auch dort können durch nanopartikuläre Formulierungen spezielle Wirkungen erzielt werden. Die Vorlesung wird einige dieser Möglichkeiten aufzeigen und erläutern, wie nanopartikuläre Systeme effektiv in den Respirationstrakt appliziert werden können.

Scherließ, Regine, 0431 880-1330

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Computational Studies on the Volume of Activated Tissue in Deep Brain Stimulation, Prof. Dr. Ursula van Rienen, Universität Rostock

06.09.2018 ab 17:00

Technische Fakultät, Gebäude D, Kaisterstraße 2, Aquarium

Abstract

Deep Brain Stimulation (DBS) is a widely used neuronal stimulation therapy for movement disorders like Parkinson’s disease and dystonias. Simulation studies can help for a deeper understanding of this therapy and, in future, for a patient-specific therapy planning aiming to prevent side effects as well. On the other hand, simulations can help e.g. to optimally select stimulation parameters in animal models.

The dielectric properties of biological tissue are based on experimental data and are subject to uncertainty, which arises from difficulties associated with the measuring process such as electrode polarisation at low frequencies, changes in the conditions of the tissue samples post mortem, and inter-individual variations. Based on the current state of measurement techniques for the dielectric properties of biological tissue, it can be assumed that uncertainty in these measurements and the resulting tissue properties will be a non-negligible factor, which has to be considered in computational models of bio-electrical applications.

In this contribution, we will introduce to the simulation pipeline to compute the Volume of Tissue Activated for a human model including uncertainty quantification and show some exemplary simulation results.

http://sfb1261.de/index.php/en/events-en/talks-for-members/talks-for-members-2018

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