illuminated Helium laboratory from outside through the window

Conferences & Workshops

Sept. 15-20, 2019


ECASIA19: 18th European Conference on Applications of Surface and Interface Analysis

Sept. 13-20, 2019

 Summer School Spectroelectrochemistry, IFW Dresden
March 28/29, 2019 

International Workshop "Quantum Dynamics, Transport, and Exotic Orders: Strolling among Spins and Strong Correlations", IFW Dresden

Dec. 4-5. 2018 UKRATOP Workshop, IFW Dresden

Oct. 1 – 2, 2018


SAW Symposium, Westin Bellevue Dresden, Dresden, Germany

Aug. 28-30, 2018 Spin , waves & interactions 2018, Greifswald, Germany

April 8- 11, 2018


667. WE-Heraeus-Seminar on System-oriented approach to thermoelectrics: Materials – Interfaces – Devices in Bad Honnef, Germany

March 11-16, 2018


Joint Conference of the Condensed Matter Divisions of the DPG and EPS,

  • Session "Geometry and Topology-Controlled Nanoarchitectures", organized by Prof. Dr. V. Fomin, IFW Dresden
  • Symposium “Topology in Condensed Matter Physics (SYTO)”, co-organizer Prof. Dr. Jeroen van den Brink, IFW Dresden
  • Symposium “Voltage Control of Functional Interfaces: Magneto-ionic Meet Memristive Systems (SYVC)”, Co-organizer Dr. Karin Leistner, IFW Dresden

Feb. 1, 2018


Workshop of the DFG Priority Programme 1458 “High Temperature Superconductivity in Iron Pnictides“, IFW Dresden

Jan.  29-31, 2018


EPSQMat 2018: International Workshop on Electron and photon spectroscopies of quantum materials: status and perspectives, IFW Dresden

Lectures this week

Wednesday 16.01.2019
Location IFW Dresden B3E.26
Speaker Franz Mertens
Topic Dynamics of vortices in 2D easy-plane magnets
We consider a 2-dimensional classical anisotropic Heisenberg model with easy-plane symmetry, i.e. the spins prefer to lie in the plane. For small anisotropy planar vortices are unstable, but so-called “non-planar vortices” are stable. They exhibit a core in which the spins point upwards or downwards. Thus a non-planar vortex is characterized by two topolocigal charges: vorticity q and polarity p = ± 1 (core spins up or down). Both q and p are constants of motion in the continuum limit. However, in discrete spin systems the polarity can be switched in different ways: scattering with spin waves, thermal noise, a magnetic field pulse, static and rotating magnetic fields, or a spin-polarized electrical current. Only the last two cases are presented in this talk.

Two vortices on a large system show a dynamics which can be classified in 4 scenarios, depending on the choice of the charges q and p for each vortex. A vortex and an antivortex either circle around each other, or go on parallel lines. The same holds for a pair of vortices or antivortices.

The case of a vortex and an antivortex with same polarities is particularly interesting: This pair actually is a solitary wave which propagates with constant velocity. When two such pairs make a head-on collision several very distinct scenarios can appear.

Finally we investigate polarity switching by a spin-polarized electric current. Here a complicated scenario exists in which a vortex-antivortex pair is created and interacts with the original vortex such that finally a new vortex with opposite polarity remains.

Invited by Dr. Volodymyr Kravchuk
Contact Grit Rötzer

Thursday 17.01.2019
Location IFW Dresden B3E.26
Speaker Armin Feist
Topic Next-Generation Ultrafast Transmission Electron Microscopy - Development and Applications

Invited by Prof. Dr. Bernd Büchner, Dr. Axel Lubk

Thursday 17.01.2019
Location IFW Dresden A2E.30
Speaker Nikolay Gnezdilov
Topic Characterization of the SYK quantum dots

Invited by Dr. Flavio de Souza Nogueira
Contact Grit Rötzer

Friday 18.01.2019
Location Leibniz IFW Dresden D2E.27
Speaker Volker Neu
Topic Probing magnetic microtextures on the nanoscale
Magnetic force microscopy (MFM) has established its place as an extremely valuable method for the investigation of magnetic microstructures on the nanometer scale. Beyond being a purely qualitative imaging technique, quantitative MFM has the capability to locally measure the stray fields and eventually provide quantitative input data for a reconstruction of the underlying magnetization structure. This requires a full calibration of the imaging properties of the MFM tip and the most general approach is through the determination of the so-called tip transfer function (TTF) in Fourier space [1-3]. A calibrated tip transforms MFM signals into true stray field values on the nanometer scale. Furthermore, the field profile is corrected for the tip broadening and thus allows a true size determination of isolated magnetic objects. Reconstructing the magnetization texture from the stray field landscape will need additional knowledge on the sample. Here, micromagnetic simulations can help by providing valid initial magnetization models.
I will report on our activities within a current European metrology project [4] to establish materials, measurement protocols and analysis procedures for a routine application of qMFM and will present various examples, which demonstrate the large benefit of treating MFM data quantitatively. These examples range from vortex states at nanowires and thin films to flux lines in superconductors and to optically written domains in magnetic data storage media [5].

[1] Hug et al. JAP 83 (1998), [2] Vock et al. APL 105 (2014), [3] Panchal et al. Sci. Rep. 7 (2017). [4] EMPIR 15SIB06 NanoMag [5] John et al., Sci. Rep. 7 (2017).

Invited by Prof. Dr. Oliver G. Schmidt
Contact Kristina Krummer

Lectures next week

Monday 21.01.2019
Location IFW Dresden D2E.27
Speaker Martin Grönke
Topic Layered chromium trihalides CrX3 (X=Cl, Br, I): synthesis and simulation by chemical vapor growth of bulk flakes and nanosheets
Invited by Prof. Dr. Bernd Büchner

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