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Proceedings Article

Ultrafast magnetism as seen by x-rays

[+] Author Affiliations
Ilie Radu

Radboud Univ. Nijmegen (Netherlands) and Helmholtz-Zentrum Berlin (Germany)

Kadir Vahaplar, Andrei Kirilyuk, Theo Rasing, Alexey Kimel

Radboud Univ. Nijmegen (Netherlands)

Christian Stamm, Torsten Kachel, Niko Pontius, Florin Radu

Helmholtz-Zentrum Berlin (Germany)

Radu Abrudan

Ruhr-Univ. Bochum (Germany)

Hermann Dürr

Helmholtz-Zentrum Berlin (Germany) and SLAC National Accelerator Lab. (USA)

Thomas Ostler, Joe Barker, Richard Evans, Roy Chantrell

The Univ. of York (United Kingdom)

Arata Tsukamoto, Akiyoshi Itoh

Nihon Univ. (Japan)

Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 82601M (February 9, 2012); doi:10.1117/12.907433
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From Conference Volume 8260

  • Ultrafast Phenomena and Nanophotonics XVI
  • San Francisco, California, USA | January 21, 2012

abstract

Revealing the ultimate speed limit at which magnetic order can be controlled, is a fundamental challenge of modern magnetism having far reaching implications for magnetic recording industry. Exchange interaction is the strongest force in magnetism, being responsible for ferromagnetic or antiferromagnetic spin order. How do spins react after being optically perturbed on an ultrashort timescales pertinent to the characteristic time of the exchange interaction? Here we demonstrate that femtosecond measurements of X-ray magnetic circular dichroism provide revolutionary new insights into the problem of ultrafast magnetism. In particular, we show that upon femtosecond optical excitation the ultrafast spin reversal of Gd(FeCo) - a material with antiferromagnetic coupling of spins - occurs via a transient ferromagnetic state. The latter one emerges due to different dynamics of Gd and Fe magnetic moments: Gd switches within 1.5 ps while it takes only 300 fs for Fe. Thus, by using a single fs laser pulse one can force the spin system to evolve via an energetically unfavorable way and temporary switch from an antiferromagnetic to ferromagnetic type of ordering. These observations supported by atomistic simulations, present a novel concept of manipulating magnetic order on different classes of magnetic materials on timescales of the exchange interaction.

© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Ilie Radu ; Kadir Vahaplar ; Christian Stamm ; Torsten Kachel ; Niko Pontius, et al.
"Ultrafast magnetism as seen by x-rays", Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 82601M (February 9, 2012); doi:10.1117/12.907433; http://dx.doi.org/10.1117/12.907433


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