FOR 2093

News

New FOR2093 publication of subprojects C4 & A1

Slow–Fast Dynamics in a Chaotic System with Strongly Asymmetric Memristive Element

The paper describes the effect of a memristive element on the dynamics of a chaotic system theoretically as well as experimentally. For this purpose, the chaotic Chua’s oscillator is extended by a memory element in the form of a double-barrier memristive device. Strong changes in the dynamics of chaotic oscillations can be observed. Numerical simulations and analysis of the extended model reveal that the underlying dynamics possesses slow–fast properties due to different timescales between the memory element and the base system. Furthermore, the stabilizing and destabilizing dynamic bifurcations are identified that are traversed by the system during its chaotic behavior.

New FOR2093 publication of subproject A2

Diffusive Memristive Switching on the Nanoscale, from Individual Nanoparticles towards Scalable Nanocomposite Devices

Nanoscale memristive devices based on metal alloy nanoparticles that are sparsely encapsulated in a thin SiO2 dielectric matrix are investigated. The measurement of current-voltage hysteresis loops at the level of individual nanoparticles, enabled by the nanoscopic contact area of a conductive atomic force microscope (C-AFM) tip, indicates reliable memristive switching for several hours of continuous operations. Moreover, morphological alterations and device failure are investigated. Furthermore, similar behaviour is encountered on macroscopic nanocomposite devices, which incorporate multiple stacks of nanoparticles and offer the possibility of tuning switching properties.

New FOR2093 publication of subprojects A1, B2 & B1

Correlation between sputter deposition parameters and I-V characteristics in double-barrier memristive devices

The impact of the deposition process of double-barrier memristive devices (DBMDs) on the memristive switching behavior is investigated. Crucial parameters of the process plasma for thin film deposition, such as floating potential, electron temperature, and the energy flux to the substrate, are correlated with the I-V characteristics of the individual memristive devices. The results from plasma diagnostics are combined with transmission electron microscopy / electron energy loss spectroscopy (TEM / EELS) and kinetic Monte Carlo simulations. The obtained results may enable a new pathway for the development of plasma-engineered memristive devices tailored for specific application.

New FOR2093 publication of subproject C3

Synchronization of nonlinearly coupled networks of Chua oscillators

The paper develops new sufficient conditions for synchronization of a network of N nonlinearly coupled Chua oscillators. The nonlinear coupling strength results in a sector, which is bounded from above and below by linear functions. The derived sufficient conditions provide a trade-off between the characteristics of the sector and the interconnection topology of the network to guarantee the synchronization of the oscillators.

E-MRS 2019 Fall Meeting - Symposium on Neuromorphic Computing

At the E-MRS fall meeting 2019 in Warsaw will the symposium F "Novel Approaches for Neuromorphic Computing: Materials, Concepts and Devices" be co-organized by the FOR2093 members Martin Ziegler and Christian Wenger. Furthermore, Martin ZIegler will give an invited talk within the symposium V "Bioinspired and Biointegrated Materials as New Frontiers Nanomaterials IX", which will be supplemented by talks from the FOR2093 members Mamathamba K. Mahadevaiah and Finn Zahari.

7th International Symposium on Integrated Functionalities (ISIF)

At the  ISIF 19  in Dublin two invited talks will be given by the FOR2093 members Hermann Kohlsted and Martin Ziegler.

New FOR2093 publication of subproject C1

Hippocampal Dentate Gyrus Atrophy Predicts Pattern Separation Impairment in Patients with LGI1 Encephalitis

The structure-function relationship and contribution of hippocampal subfields to pattern separation was elucidated by examining patients with the rare LGI1 encephalitis showing lesions to hippocampal subfields. Structural sequelae were determined by hippocampal subfield volumetry for the DG, CA1, and CA2/3. Patients showed an overall memory deficit including a significant reduction in pattern separation performance. These results corroborate the framework of a regional specialization of hippocampal functions involved in cognitive processing.

International Conference on Solid State Ionics (SSI-22)

At the SSI-22 in Gangwondo two invited talks will be given by the FOR2093 members Tom Birkoben und Martin Ziegler  in the symposia IE04 and IE05, respectively.

Color Line Workshop II: Neurotronics

The research unit 2093 is organizing the second international Color Line Workshop named Neurotronics in Kiel and on the ferry Kiel - Oslo - Kiel in the beginning of September 2019.

DPG Spring Meeting - Tutorial on Memristive Devices and Neuromorphic Computing

At the  DPG spring meeting, Regensburg 2019, a tutorial named  "Resistive Switching: From basic physics of memristive devices to neuromorphic systems" will be co-organized by the FOR2093 member Martin Ziegler. Among others, the FOR2093 members Thomas Mussenbruck and Hermann Kohlstedt will give two invited talks within the tutorial.

New FOR2093 publication of subproject C1

A memristive plasticity model of voltage-based STDP suitable for recurrent bidirectional neural networks in the hippocampus

A voltage-based STDP rule for memristive devices is derived and is compared to electrophysiology plasticity data. Utilizing the STDP rule, a neural network inspired by the auto-associative CA3 network of the hippocampus is simulated. The implemented network allows the discrimination and processing of mnemonic pattern information. On one hand, the results can be used for the design of appropriate memristive devices for neuromorphic computing and on the other hand, they can be used for the development of complex neuromorphic networks.

New FOR2093 publication of subprojects B1 & A1

Filament Growth and Resistive Switching in Hafnium Oxide Memristive Devices

Kinetic Monte Carlo simulation models are used to investigate resistive switching in HfO2 based RRAM devices. The models are consistently coupled to the electric field and different current transport mechanisms have been considered. The numerical results are in excellent agreement with experimentally obtained data. Important device parameters, which are difficult or impossible to measure in experiments, are calculated (e.g. shape of the conductive filament, width of filament constriction, current density, and temperature distribution)

Best paper award for Rajeev Ranjan form the TU Hamburg-Harburg at 39th INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS AND SIGNAL PROCESSING

Best paper award for Rajeev Ranjan (TU Hamburg-Harburg) at the IEEE TSP 2016

5. FOR 2093 meeting at the Ruhr University in Bochum

 5. FOR 2093 meeting at the Ruhr University in Bochum

Contribution to the 47 IFF Spring School in Jülich

Martin Ziegler gives at the IFF Spring School in Jülich about memristive tunneling devices and their application in neuromorphic circuits.

Two new FOR2093 papers shwoning the synchronization of two memristively coupled van der Pol oscillators and a C-MemFlash device

Two new FOR2093 Publications online

see papers

Kinetic simulation of filament growth dynamics in memristive electrochemical metallization devices

New FOR 2093 publication show filamental growth within ECM cells

read paper

Pressemitteilung zur FOR2093 Publikation

Kieler und Bochumer Forschende entwickeln neuartigen Informationsspeicher

Pressemeldung Nr. 355/2015

Pattern recognition with TiOx-based memristive devices

In einer aktuellen FOR 2093 Veröffentlichung wird die Entwicklung eines TiOx -basierenden memristiven Bauelements für Mustererkennungs -Netzwerke beschrieben.

Priv.-Doz. Dr. George Popkirov als Gastwissenschaftler in Kiel

PD Dr. George Popkirov

von der Bulgarian Academy of Sciences in Sofia ist als Gastwissenschaftler der FOR 2093 im TP A2 zu Gast in Kiel

FOR2093 Session auf der Euro Intelligent Materials 2015 in Kiel

FOR 2093 organisiert Session auf der Euro Intelligent Materials 2015 in Kiel.

Intelligent Mat. 2015

Hebbsches Plastizitätsmodell für memristive Bauelemente

In einer aktuellen FOR Publikation wird ein neues Modell zur Nachbildung synaptischer Plastizität mittels memristiver Bauelemente vorgestellt.

zur Veröffentlichung

Auf den FOR Treffen am 30. 03. 2015 in Bochum haben die Doktorandinnen und Doktoranden Marina Ignatov und Sven Dirkmann zu ihren Sprechern gewählt.

Doktorandensprecher der FOR sind: Marina Ignatov und Sven Dirkmann