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
Fumitaka Ohashi Clathrates with group IV materials: novel photo-absorption materials for solar cells 28.03.2013 15:00
Xavier Marti Antiferromagnetic semiconductor spintronics 27.03.2013 10:00
Prof. Laurent Baulieu Minimizing gauge-functional for 2-d gravity and string theory 14.03.2013 15:00
Takatoshi Yamada Microscopic C-AFM/KPFM/Raman characterization of thermal and plasma CVD graphene 11.03.2013 15:30
Nava Setter Ferroelectric nano-wires 07.03.2013 15:00
Hiroki Tsuchiura Coercivity mechanism of Nd-Fe-B sintered magnets 07.03.2013 14:00
Takeshi Tayagaki Toward highly efficient Si solar cells using Ge/Si heterostructures 01.03.2013 13:00
Kirill Svit, PhD. student Formation and tunneling spectroscopy of CdS QDs obtained by Langmuir-Blodgett method 01.03.2013 10:00
Maurits W. Haverkort Theory of novel spectroscopic techniques: Probing spin, charge and orbital physics 28.02.2013 15:00
Prof. Chang Hee Nam Ultrafast and relativistic laser science research 28.02.2013 10:00
Marian Varga Diamond in Nanotechnology 14.02.2013 10:00
Tomáš Jungwirth Optical spin-transfer and spin-orbit torques 13.02.2013 15:00
Veronica Goian a Stanislav Kamba Hybrid improper-ferroelectric phase transition in Ca3Mn2O7; News from Ferro 2013 in Ames, USA 05.02.2013 10:00
Steven M. Kahn The Large Synoptic Survey Telescope 04.02.2013 17:00
Pavel Řezníček Selected B-physics analyses in the ATLAS experiment 31.01.2013 14:00
Hector Vazquez Theoretical results in Single Molecule Transport 29.01.2013 15:00
Jiří Klimeš Van der Waals forces in density functional theory 22.01.2013 15:00
Christelle Kadlec Metamaterials in the THz range 22.01.2013 10:00
Petr Trávníček Activities of the Institute of Physics in the Pierre Auger Observatory programme and other astroparticle physics projects 17.01.2013 14:00
Simone Babuin Quantum turbulence in flows of superfluid 4He 15.01.2013 15:00
Jiří Dohnal La Isla del Coco, or, Sharks are our friends 20.12.2012 15:00
Prof. Jacques Ferré First and Second Order Magneto-Optical Effects in Magnetic Bulk Materials or Ultrathin Films 10.12.2012 14:00
Jeevaka Weerasinghe Terahertz Dielectric properties of (Ba,Sr)TiO3 systems from First principles 04.12.2012 10:00
Karel Král Electron-phonon interaction in the photoluminescence of quasi-zero dimensional nanostructures 27.11.2012 15:00
Pavel Novák Calculation of crystal field parameters 15.11.2012 14:00
Martin Nikl R&D of inorganic scintillation materials in the Institute of Physics ASCR 14.11.2012 15:00
Pierre-Eymeric Janolin The twist and turns in perovskites 08.11.2012 10:00
Ilja Turek Ab initio theory of magnetic anisotropies in random tetragonal Fe-Co alloys 06.11.2012 15:00
prof. Toshiya Sakata In vitro biosensing with semiconductor-based platform 06.11.2012 10:00
Jaroslav Trnka Scattering Amplitudes and the Positive Grassmannian 05.11.2012 15:00

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