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TRR227 postdoc Dr. Bo Liu obtains new position

Dr. Bo Liu, who worked as a postdoc in project A01 of Martin Weinelt for 3 years from 2019 until 2022, accepted a tenure-track assistant professorship at Nanjing University , China.

May 24, 2023

Insights to spin transport–driven ultrafast magnetization dynamics - TRR 227 results published in Science Advances

TRR 227 PI Martin Weinelt (project A01) and coworkers published their latest work on ultrafast magnetization dynamics in the journal "Science Advances". Using time- and spin-resolved photoemission spectroscopy, the researchers studied an antiferromagnetically coupled Gd/Fe bilayer, a prototype system for all-optical switching. Spin transport leads to an ultrafast drop of the spin polarization at the Gd surface, demonstrating angular-momentum transfer over several nanometers.

May 23, 2023

2023 Terahertz Science and Technology Roadmap just published in the Journal of Physics D: Applied Physics

The Journal of Physics D: Applied Physics just published “ The 2023 Terahertz Science and Technology Roadmap ”. It contains two contributions from the Collaborative Research Center “Ultrafast spin dynamics” and the Terahertz Physics Group: a perspective article on “Terahertz spintronics and magnetism” and another one on “Terahertz emission spectroscopy and imaging”.

Apr 27, 2023

Editors' suggestions of Phys. Rev. journals highlight TRR 227 research on THz spintronics

Understanding and improving spintronic terahertz-wave emission: Spintronic terahertz (THz) emitters (STEs) are a novel class of broadband, low-cost and efficient THz sources (see Fig. 1). They exhibit interesting opportunities for applications in the fields of THz physics and THz photonics where THz electromagnetic pulses are used for material characterization, imaging and spectroscopy. Consequently, STEs are meanwhile commercially available from the Berlin-based startup TeraSpinTec GmbH .

Mar 14, 2023

Dr. Maximilian Paleschke - Heinz-Bethge Prize for Material Sciences 2022

For his excellent dissertation, Maximilian Paleschke was awarded with the Heinz-Bethge-Prize for Material Sciences 2022. - Congratulations!

Jan 18, 2023

Stuart Parkin - one of the Highly Cited Researchers 2022

In this year’s survey of Clarivate™ "Highly Cited Researchers" , almost 7.000 researchers are listed across all disciplines of science, 369 of them work in Germany. Stuart Parkin of the MPI für Mikrostrukturphysik in Halle and TRR 227 PI of project B10 is one of them. - Congratulations!

Nov 28, 2022

Crowded auditorium at the PhD Focus Session 2022

This year’s PhD Focus Session of the division MA at the DPG Meeting of the section condensed matter (SKM), held at the University of Regensburg, was jointly organized by PhD students from the collaborative research centers TRR227 “Ultrafast Spin Dynamics” from Berlin/Halle and TRR173 “Spin+X” from Mainz/Kaiserslautern.

Oct 05, 2022

TRR 227 results in Nature Communications - Physicists generate new nanoscale spin waves

Strong alternating magnetic fields can be used to generate a new type of spin wave that was previously just theoretically predicted. This was achieved for the first time by a team of physicists from Martin-Luther-Universität Halle-Wittenberg (MLU). They report on their work in the scientific journal “Nature Communications” and provide the first microscopic images of these spin waves.

Sep 15, 2022

TRR227 scientist Dr. Unai Atxitia accepted new position

Dr. Unai Atxitia, PI of project A08 during the 1 st funding period, accepted a tenure-track position as research scientist and team leader at the Instituto de Ciencia de Materiales de Madrid , Spain.

Aug 01, 2022

Single-pulse switching in ferrimagnets - TRR 227 paper in Phys. Rev. Lett.

U. Atxitia (project A08) and his PhD student F. Jakobs recently published a paper on universal criteria for single femtosecond pulse ultrafast magnetization switching in ferrimagnets in Physical Review Letters.

Jul 12, 2022

TRR 227 spintronics paper published in Nano Letters

An intermediate layer consisting of a few atoms helps to improve the transport of spin currents from one material to another. Until now, this process involves significant losses.

May 10, 2022

Light-Induced magnetization at the nanoscale - PRL paper of B06

Together with an internatonal team of colleagues, TRR227 PI J. Berakdar (project B06) and coworkers published their latest results on magnetizing an atomic gas with light in the APS journal Physical Review Letters . The theorists predict that an atomic gas could be magnetized using high-power lasers with patterned wavefronts, something that could provide a noninvasive way to quickly manipulate the magnetic properties of the gas. The paper was recently highlighted on the front cover of the Vol. 128, Issue 15, 15 April 2022 . In addition, it was covered by a Synopsis in Physics with the title " Magnetizing an Atomic Gas with Light ".

Apr 15, 2022

Magnetism hits the high notes - TRR227 results published in Science

In the latest issue of Science (10 March 2022), TRR227 PI Georg Woltersdorf (project B02) and his team report on how frequencies can easily be multiplied without special circuitry.

Mar 11, 2022

Best Poster Award and Best Contributed Talk Award for TRR227 PhD students

At the 757 th WE-Heraeus-Seminar on "Non-Linear Magnetism" held at Physikzentrum Bad Honnef in early January 2022, Oliver Gückstock and Lisa-Marie Kern, two PhD students of our TRR 227, received the best Poster Award and the best Contributed Talk Award, respectively.

Jan 13, 2022

DPG PhD Focus Session 2022: “The Hitchhiker’s Guide to Spin Phenomena at the Space and Time Limit”

The upcoming PhD focus session at the DPG Spring Meeting in Regensburg 2022 is jointly organized by young scientists from the SFB/TRR173 Kaiserslautern/Mainz and the SFB/TRR227 from Berlin/Halle.

Jan 10, 2022

TRR227 results in PRX - Ultrafast Magnetization Quenching

Recent results published in Phys. Rev. X: Researchers of the Collaborative Research Center TRR227 “Ultrafast spin dynamics” at Freie Universität Berlin found that the magnetization of laser-excited ferromagnetic iron undergoes the same dynamics independent of the wavelength of the driving laser pulse. Therefore, it is just the amount of heat dumped into the electrons at a given moment that determines the course of the demagnetization.

Dec 21, 2021

DFG approves 2nd funding period of CRC/TRR 227

Second funding period 2022 - 2025.

Nov 25, 2021

Dr. A. Johansson (MLU Halle) and Dr. T. S. Seifert (FU Berlin) rewarded

Two PhD students/researchers of the TRR227 share the prestigious INNOMAG e.V. Dissertation Prize 2020 of the Magnetism Division of the Germany Physical Society: Dr. Annika Johansson (MLU Halle, group Quantum Theory of the Solid State ) and Dr. Tom Sebastian Seifert (FU Berlin, THz Physics group ).

Oct 01, 2021

The CRC/TRR 227 takes on responsibility for training in research integrity

TRR 227 iRTG coordinator Britta Anstötz is trained to be the trainer in "Good Scientific Practice".

Sep 01, 2021

New functionalities of spintronic terahertz emitters: rapid polarization control and on-chip integration

TRR227 scientists publish latest results on spintronic terahertz emitters in Optica and ACS Appl. Nano Mater.

Aug 23, 2021