Project B06 - Goennenwein, Nowak

Funding period: 2021 – 2024

Project leaders: Sebastian T. Gönnenwein and Ulrich Nowak

Scientific staff: Tobias Dannegger, Harshita Devda, Marvin Weiss

This project aims at studying the high-frequency spin fluctuations in magnetically ordered materials and heterostructures using a combination of experimental and theoretical methods. We want to use pure optical spin-noise spectroscopy to investigate the relationship between spin and magnon noise at GHz frequencies, and we also want to develop ultrafast spin-noise spectroscopy experiments to investigate the dynamics of spin fluctuations on picosecond time scales. With the accompanying atomistic spin simulations, we will simulate the spin or magnon noise and thus both contribute to the interpretation of the experiments and make predictions for more complex systems such as magnetic heterostructures.

List of publications

Current preprints

• Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy
  M. A. Weiss, A. Herbst, J. Schlegel, T. Dannegger, M. Evers, A. Donges,
  M. Nakajima, A. Leitenstorfer, S. T. B. Goennenwein, U. Nowak, and  T. Kurihara, 
  arxiv:2301.02006 - published 5 January 2023

2023

• Magnetic properties of hematite revealed by an ab initioparameterized spin model
  T. Dannegger, A. Deák, L. Rózsa, E. Galindez-Ruales, S. Das, E. Baek, M. Kläui, L. Szunyogh, and U. Nowak
  Phys. Rev. B 107, 184426 - published 12 May 2023
   
• Inertial effects in ultrafast spin dynamics
  R. Mondal, L. Rózsa, M. Farle, P. M. Oppeneer, U. Nowak, and M. Cherkasskii
  J. Magn. Magn. Mater. 579, 170830 - published 15 May 2023

2022

• Polarized phonons carry angular momentum in ultrafast demagnetization
  S. R. Tauchert, M. Volkov, D. Ehberger, D. Kazenwadel, M. Evers, H. Lange, A. Donges, A. Book, W. Kreuzpaintner, U. Nowak, and P. Baum
  Nature, 602, 73 – published 2 February 2022
  related also to projects A04, B02 and B05
  article in campus.kn

2021

• Nutation in antiferromagnetic resonance
  R. Mondal, S. Großenbach, L. Rózsa, and U. Nowak
  Phys. Rev. B 103, 104404 - published 02 March 2021

Further Publications 

• All-optical control and metrology of electron pulses
  C. Kealhofer, W. Schneider, D. Ehberger, A. Ryabov, F. Krausz, and P. Baum
  Science 352, 6284, 429 - published 22 April 2016 
   
• Tilted Electron Pulses
  D. Ehberger, A. Ryabov, and P. Baum
  Phys. Rev. Lett. 121, 094801 – published 29 August 2018
   
• Diffraction and microscopy with attosecond electron pulse trains
  Y. Morimoto, and P. Baum 
  Nat. Phys. 14, 252 - published 27 November 2017
   
• Electron microscopy of electromagnetic waveforms
  A. Ryabov, and P. Baum
  Science 353, 6297, 374 - published 22 July 2016