Fyzikální ústav Akademie věd ČR

Semináře

Charged domain walls in BaTiO3 single-crystals

Út, 20/10/2015 - 10:00 - 11:00

Dr. P. Bednyakov (École Polytechnique Fédérale de Lausanne, Switzerland)

Recently observed properties of charged ferroelectric domain walls (CDWs) make these structures promising for application in future electronics. It was demonstrated experimentally that the quasi two-dimensional electron gas is present at head-to-head CDWs [1]. The CDWs are therefore good conductors that can be moved by an external electric field. As suggested by theory [2] and experiment [3] CDWs with very low spacing may cause the enhancement of piezoelectric and dielectric properties. However, the problem of controlled regular growth and formation of CDWs is not well understood.

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In silico studies of electronic current in nano-junctions: Exciting atomic motion

Čt, 22/10/2015 - 15:00 - 16:00

Mads Brandbyge (Department of micro and nanotechnology & Center for Nanostructured Graphene (CNG), Technical University of Denmark (DTU), Denmark)

In the Landauer approach to nanoscale transport the electrons are assumed to bypass a conducting junction ballistically and equilibrate through energy exchange in the electrodes.

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Interplay of charge, spin and thermal imbalances in normal-metal/ferromagnet bilayers

Pá, 23/10/2015 - 10:00 - 11:00

Can Onur Avci (ETH Zurich)

Recent demonstrations of magnetization switching driven by current-induced spin-orbit torques (SOTs) have drawn considerable attention in the field of spintronics. The SOTs are associated with the spin Hall and interfacial effects, and have been found to occur in a variety of normal-metal/ferromagnet systems. In this talk I will present harmonic transverse (Hall) and longitudinal (magnetoresistance) measurements on a variety of normal-metal/ferromagnet systems with a special focus on Pt/Co, Ta/Co layers with in-plane magnetization. I will discuss a new magnetoresistance effect (unidirectional spin Hall magnetoresistance) that we have recently discovered.

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Manipulation of magnetization by spin-orbit torques

Pá, 23/10/2015 - 14:00 - 15:00

Kevin Garello (ETH Zurich)

Recent demonstrations of perpendicular magnetization switching induced by in-plane current injection in ferromagnetic heterostructures have drawn attention to a class of spin torques based on orbital-to-spin momentum transfer (SOTs).
After describing the main spin-orbit interactions observed in ferromagnetic heterostructures and some of our latest measurements, I will present their straightforward impact on magnetic memory technologies.

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Vít Zajac Charge transport in THz regime: carrier localization vs. effective medium effects 24.10.2013 10:00
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Jan Fischer Výpočet vazbového parametru α_s z hadronového rozpadu leptonu τ 17.10.2013 14:00
Neha Topnani and Anna Zep Selected results from our partners in liquid crystal research 17.10.2013 10:00
Peter West Symmetries and their role in fundamental physics 15.10.2013 15:00
Mateusz Mrukiewicz Dual-frequency nematic liquid crystals 15.10.2013 10:00
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Martin Schnabl Stringy and higher-spin activities in the theory department 03.10.2013 14:00
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Alexander Kupčo Novinky z konference EPS 2013 19.09.2013 14:00
Cedric Rocha Leao Ab-initio investigation of the degradation process in TlBr: causes and possible fixes 18.09.2013 15:00
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Jose Repond Imaging Calorimetry for Lepton Colliders 05.09.2013 14:00
Anna Artmenko XPS analysis of plasma polymers and nanocomposite films without breaking vacuum 03.09.2013 13:00
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Prof. A. Nikitin Integrable models with matrix potentials 26.08.2013 15:00
Dr. Ingo Dirnstorfer Synergies between photovoltaics and microelectronics 19.07.2013 10:00
Prof. R. Gopakumar Minimal Model Holography 18.07.2013 15:00

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