Fyzikální ústav Akademie věd ČR

Seminars

Charged domain walls in BaTiO3 single-crystals

Tue, 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

Thu, 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

Fri, 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

Fri, 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.
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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Past Seminars
E. Z. Kurmaev X-ray spectra and electronic structure of Fe and Cu superconducting pnictides 11.09.2014 14:00
Prof. Jordi Arbiol Exploring the optical properties of nanomaterials at sub-nanometer scale with a direct correlation to its structure at atomic scale 11.09.2014 11:00
Jiří J. Mareš The Concept of Temperature - Critical Analysis 10.09.2014 14:00
Ron Jansen Silicon spintronics 08.09.2014 10:00
Martin Veis Magneto-optical spectroscopy and ellipsometry of nanostructures 28.07.2014 10:00
M. I. Tsindlekht DC and AC Magnetic Properties of the Thin Walled Superconducting Niobium Cylinder 24.07.2014 14:00
Prof. Jeffrey McCord Magnetic materials as seen by magneto-optics 21.07.2014 10:00
Martin Eckstein Nonequilibrium control of the magnetic exchange interaction 17.07.2014 14:00
Prof. Robert L. Byer LASERs at Stanford: from the Laboratory to Commercial Products 08.07.2014 10:00
Prof. Juris Purans Synchrotron radiation XAFS studies of local structure with femtometer accuracy 23.06.2014 10:00
Prof. Dr. Juan Carlos Cuevas Heat-dissipation in atomic-scale junctions 10.06.2014 10:00
Dr. Thibault Derrien Ultrashort laser processing of solids. Numerical investigation of sub-wavelength optical and thermal effects in nanomaterials 05.06.2014 16:00
Igor Bieloshapka Сomposite catalytic materials for improving direct formic acid fuel cells efficiency 03.06.2014 13:00
Prof. Siegmund Greulich-Weber Photoelectrochemical Water Splitting 02.06.2014 10:00
Lucia Nasi Transmission electron microscopy study of semiconductor nanowires and nanostructured materials 28.05.2014 10:00
Prokop Hapala Is the Concept of Electronic Band Structure valid for Si Nanocrystals of few nm in Size? 27.05.2014 15:00
José M. Gómez-Rodríguez Probing and Modifying Graphene at the Atomic Scale with Scanning Tunneling Microscopy 27.05.2014 10:00
Antonio Lucianetti Physics behind 100J/10Hz laser for new scientific applications 21.05.2014 15:00
Soon Cheol Hong Roles of nonmagnetic elements on enhancement of perpendicular magnetocrystalline anisotropy: first-principles studies 13.05.2014 15:00
Krisztian Palotas STM contrast: The role of the tip 13.05.2014 10:00
Vladimír Zobač Non-adiabatic molecular dynamics with electron transitions 06.05.2014 15:00
Richard Berndt A STM approach to molecular conductance and the properties of ZnO 06.05.2014 15:00
Oleg Babchenko Fabrication and characterization of selected carbon-based nano-structures 06.05.2014 13:30
Prof. Nikolay Galkin Silicon-Silicide nanocomposite heterostructures for Silicon based photonics, opto- and thermoelectronics 06.05.2014 13:00
Romuald Lemański Gapless metallic charge-density-wave phase driven by strong electron correlations 29.04.2014 15:00
Magdaléna Hromadová Electrochemically addressable molecules for molecular electronics 29.04.2014 09:30
Roman Pasechnik Vector - like Technicolor at the LHC 28.04.2014 14:00
Gregorio Bernardi Recent Results from the Tevatron 23.04.2014 10:00
J. Enrique Ortega Electronic states at donor-acceptor/ metal interfaces probed with electron spectroscopies: NEXAFS, XPS and UPS 22.04.2014 10:00
Petr Trávníček Highest energy cosmic rays at observatories CTA and Pierre Auger 16.04.2014 15:00

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