Fyzikální ústav Akademie věd ČR

Seminars

Charged domain walls in BaTiO3 single-crystals

Tuesday, 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

Thursday, 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

Friday, 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

Friday, 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
R. Cimrman, M. Novák, and J. Vackář Isogeometric analysis, environment-reflecting separable pseudopotentials and Hamiltonian rank-m updates in the evaluation of Hellman-Feynman forces 12.05.2015 15:00
Miroslav Kotrla Multiscale modeling of magnetic metals heteroepitaxial overlayers. 05.05.2015 15:00
Michal Svatoš Measurement of the isolated prompt photon + b jet cross-section in pp collisions at 8 TeV 30.04.2015 13:30
Dr. Xavier Martí From/to science to/from business 30.04.2015 10:00
Matthias Vojta Coupled-dimer magnets: Systematic expansions, quantum criticality, and disorder 28.04.2015 15:00
Bert Voigtländer Charge Transport Measurements at the Nanoscale using a Multi-Tip STM 28.04.2015 10:00
Prof. David A. Crandles The Search for Ferromagnetism in SrTiO3 28.04.2015 10:00
Prof. Shih-Jye Sun The property variations of ZnO responding to UV irradiations 27.04.2015 13:30
Prof. Hua Shu Hsu Introduction to Magnetic Circular Dichroism and its application in magnetic semiconductor 27.04.2015 13:00
Jiří Chaloupka Magnetism of layered honeycomb iridates 21.04.2015 15:00
Alexander Poddubny Surface engineering in silicon- and germanium- based nanocrystals 21.04.2015 10:00
Hendrik Vita Interaction of magnetic and non-magnetic metals with graphene 14.04.2015 15:00
Roman Fasel Electronic and optical properties of atomically precise graphene nanoribbons 09.04.2015 15:00
Holger Kersten Non-conventional diagnostics for process plasmas 08.04.2015 15:00
Jan Skolimowski Anderson and Mott transitions in presence of the spin-dependent disorder 07.04.2015 15:00
Prof. David Crandles Infrared spectroscopy of dilute magnetic semiconductors 02.04.2015 10:00
Prof. Gerard Mourou Extreme Light: Bridging Optics and Fundamental High Energy Physics - The first steps towards Zeptosecond and Zettawatt Science 25.03.2015 17:00
Vladislav Pokorný Perturbation theory of a zero-pi transition in a superconducting quantum dot system 24.03.2015 15:00
Tomáš Polívka Carotenoid photophysics Rich excited-state properties of seemingly simple molecules 24.03.2015 10:00
Jiří Mareš K- and eta mesons in atomic nuclei 19.03.2015 14:00
Styliani Skiadopoulou Spin and lattice excitations of a BiFeO3 thin film and ceramics 17.03.2015 10:00
Pavel Středa Scattering matrix approach to the anomalous Hall effect 11.03.2015 10:00
Veronica Goian Ferroelectricity and spin-phonon coupling in multiferroic Sr1-xBaxMnO3 03.03.2015 10:00
Dr. Deepak Kar All about partonic showers 19.02.2015 14:00
Jiří Červenka DNA detection using graphene and diamond 17.02.2015 10:00
Pablo Merino Single photon emission in STM-induced luminescence from fullerene excitons 10.02.2015 10:00
Dr. Barbara Trzeciak Heavy flavor era at RHIC 05.02.2015 14:00
Anna Fucikova Various ways of preparing and modifying silicon nanocrystals 03.02.2015 10:00
Karel Výborný Terahertz Spectroscopy of Artificial Graphene 22.01.2015 14:00
Pavel Márton Phase­‐field simulation of dielectric response of multidomain BaTiO3 20.01.2015 10:00

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