Aktuelles

Relais satellite for Chinese Chang'E4 lunar mission successfully launched

25.05.2018

The relais satellite for the Chinese lunar mission Chang'E4 was successfully launched on May 21, 2018. Chang'E4 itself is foreseen to be launched in December this year and then fly to and land on the far side of the Moon. The relais satellite is needed for communication with the lander and its scientific payload. The Extraterrestrial Physics Division developed and built a radiation monitor which is part of the payload and is currently being tested together with the lander in Beijing.

There's a short article about it in Nature:
https://www.nature.com/articles/d41586-018-05231-9

and a youtube video:
https://www.youtube.com/watch?v=TC1bsPDsKgQ

Earth moon satellite relation
(picture credit: LESEC)

Discovery of a novel spin structure

16.05.2018

Today the interplay of exchange and Dzyaloshinskii-Moriya interaction (DMI) at transition-metal interfaces is a focus of research in condensed matter physics since it can lead to topologically non-trivial spin structures such as skyrmions and antiskyrmions which are promising for spintronic applications. Higher-order exchange interactions beyond pairwise Heisenberg exchange have received much less attention. The groups of Prof. Roland Wiesendanger (University of Hamburg) and of Prof. Stefan Heinze (CAU Kiel) now demonstrate based on spin-polarized scanning tunneling microscopy and density functional theory that higher-order exchange interactions can play a decisive role in transition-metal trilayers and that their competition with DMI can lead to novel types of spin structures (see figure). Their work recently published in Physical Review Letters "Competition of Dzyaloshinskii-Moriya and higher-order exchange interactions in Rh/Fe atomic bilayers on Ir(111)" also demonstrates that higher-order exchange needs to be taken into account in the search for novel transition-metal interfaces potentially promising for complex spin structures such as skyrmions.

Skyrmion research in Top 100 Scientific Reports Physics papers in 2017

27.04.2018

The publication on Enhanced skyrmion stability due to exchange frustration from Stephan von Malottki, Bertrand Dupé, and Stefan Heinze (CAU Kiel) in collaboration with Pavel Bessarab (University of Iceland) and Anna Delin (KTH Stockholm) has been selected as one of the top 100 papers of more than 3000 articles in physics published in Scientific Reports in 2017. The work shows that the frustration of long range exchange interactions – a typical feature in itinerant electron magnets – is a route towards enhanced skyrmion stability which is essential for future applications in spintronic devices.

Plasma Germany tagte in Kiel

27.04.2018

Das deutsche Kompetenznetz für Plasmatechnologie „Plasma Germany“ traf sich am 17. und 18. April 2018 an der Christian-Albrechts-Universität zu Kiel (CAU) zur Frühjahrssitzung. Rund 30 Expertinnen und Experten aus Wissenschaft und Industrie tauschten sich über aktuelle Themen der Plasmatechnik aus. Unter anderem diskutierten sie, wie sich plasmabasierte Beschichtungsprozesse für Anwendungen von Industrie 4.0 verbessern lassen. Plasmatechnologie ist für viele Prozesse der Halbleiter-, Dünnschicht- oder Optikindustrie sowie für die Medizintechnik relevant. http://www.uni-kiel.de/pressemeldungen/index.php?pmid=2018-109-plasmagermany

Fast CMEs Continue to Decelerate in the Outer Heliosphere

19.02.2018

Most fast coronal mass ejections will be decelerated into ambient solar wind quickly in the inner heliosphere, but some of them continue the deceleration with an even larger amplitude beyond 1 AU.

 

Interplanetary coronal mass ejections (ICMEs) are the major drivers of severe space weather near Earth and other planets. Freiherr von Forstner et al. [2018] provide multi-spacecraft observations of a set of ICMEs, associated shocks and resultant decreases of the flux of cosmic rays between the orbits of Earth and Mars. A new technique is developed to assess the kinematic evolution of ICMEs beyond 1 AU, which is then supported by modeling techniques. Stronger continuous deceleration between 1 AU and Mars is found for some events, indicating further complexity of the interaction of ICMEs with ambient solar wind in the outer heliosphere. This work advances our understanding of the kinematic evolution of ICMEs beyond 1 AU. Future observations by Solar Orbiter and Parker Solar Probe will complement the improving global picture of ICME evolution throughout the heliosphere.

Citation: Freiherr von Forstner J.L. et al., [2018], Using Forbush decreases to derive the transit time of ICMEs propagating from 1 AU to Mars, Journal of Geophysical Research: Space Physics, 123, http://doi.org/10.1002/2017JA024700

Praktikumsbetreuung für das Sommersemester gesucht!

02.02.2018

Am IEAP werden noch Assistentinnen und Assistenten sowie studentische Hilfskräfte für die Praktikumsbetreuung gesucht :

  • Physikalisches Grundpraktikum Teil 1/Teil 2, jeweils Di 8:30-11:30 Uhr und Do 13-16 Uhr

5 Betreuer/innen (Lehrverpflichtung jeweils 1,25 SWS) + 5 Hilfskräfte pro Block
Erster Block: 10.4.-27.4.
Zweiter Block: 3.5.-31.5. 
Dritter Block: 5.6.-21.6.
Vierter Block: 26.-12.7.

Bitte bei Herrn Dr. de Manuel (Tel. 0431-880-4118, demanuel@physik.uni-kiel.de) melden.

 

  • Physikalisches Nebenfachpraktikum, jeweils maximal 5 Betreuer/innen + 5 Hilfskräfte pro Termin.
    Lehrverpflichtung  2 SWS/Termin.
    Termine am Mo, Di, Mi, Fr 14-18 Uhr, Do 8-12 Uhr vom 9.4.-13.7.

Bitte bei Herrn Dr. Steigies (Tel. 0431-880-1763, steigies@physik.uni-kiel.de) melden und/oder hier eintragen: http://praktikum.physik.uni-kiel.de/nf/

Magnetoresistance of ''handmade'' dimers

23.01.2018

Spin-orbit coupling links spin and momentum degrees of freedom by the Hamiltonian H = ξLS (L, S: orbital momentum and spin operators, ξ: coupling strength). It is the origin of phenomena such as magnetocrystalline anisotropy and anisotropic magnetoresistance, which are of fundamental interest and important for sensor applications. To tune spin-orbit coupling at a single atom, the high rotational symmetry of the atom should be reduced. Johannes Schöneberg, Alexander Weismann and Richard Berndt achieved this by constructing dimers from single Pb atoms on an Fe double layer substrate, whose domain pattern exhibits suitable magnetization directions. First-principles calculations by Paolo Ferriani and Stefan Heinze reveal the molecular orbitals that cause the large observed anisotropic magnetoresistance. The results are published in Physical Review B "Tunneling anisotropic magnetoresistance via molecular Pi orbitals of Pb dimers" and have been highlighted by an Editors' suggestion for papers that the editors and referees find of particular interest, importance, or clarity.

Saturday Morning Physics ab 11. November 2017

07.11.2017

Auch Ende 2017 startet wieder die Vorlesungsreihe 'Saturday Morning Physics', in welcher an fünf aufeinander folgenden Samstagen aktuelle Themen der Physik für Schüler_innen, Lehrer_innen und Eltern präsentiert werden. Freuen Sie sich mit uns auf spannende Vorträge und Experimente. Als Belohnung für eine regelmäßige Teilnahme gibt es, wie jedes Jahr, auch diesmal für teilnehmende Schülerinnen und Schüler die Saturday-Morning-Physics Diplome, sowie für teilnehmende Lehrkräfte die Anerkennung als Fortbildung durch das IQSH.

Weitere Informationen (wie Veranstaltungszeitraum und Starttermin) entnehmen Sie bitte den folgenden Links:

Veranstaltungsseite (Website)

Veranstaltungsplakat (PDF-Format)

Conductance of a molecular wire

20.09.2017

Plenty of publications report on the conductance of molecular wires between electrodes. Characterization of the junction geometry, however, is usually missing. We synthesized a molecule for low-temperature STM experiments that stands vertically on a substrate. Despite this reductionist approach, its conductance data turned out to be
complex. Calculations show that geometrical changes, orbital symmetries, and bond formation control the conductance. This joint work within SFB677 by
Torben Jasper-Tönnies, Aran Garcia-Lekue, Thomas Frederiksen, Sandra Ulrich, Rainer Herges, and Richard Berndt has recently been published in Physical Review Letters and highlighted as Editors' Selection.

M.Sc. Erik von Wahl erhält Student Award für seinen Beitrag auf der AEPSE 2017

18.09.2017

Im Rahmen der „11th Asian-European International Conference on Plasma Surface Engineering“ vom 11.-15.09.2017 in Jeju / Südkorea erhielt MSc Erik von Wahl aus der AG Plasmatechnologie den „Student Awards“ für seinen Beitrag „Characterisation of nanoparticle growth in a CCRF plasma by Langmuir probe measurements and particle extraction“.