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Ultrafast Magnetism as Seen by X-rays
Radu, Ilie; Vahaplar, Kadir; Stamm, Christian et al.
2012In ULTRAFAST PHENOMENA AND NANOPHOTONICS XVI
 

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Keywords :
Ultrafast magnetization switching; Exchange interaction; X-ray Magnetic Circular Dichroism MAGNETIZATION; REVERSAL Engineering; Optics; Physics Engineering; Electrical Electronic; Optics; Physics
Abstract :
[en] 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.
Disciplines :
Physics
Author, co-author :
Radu, Ilie;  Radu, I (Reprint Author), Radboud Univ Nijmegen, Inst Mol Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands. Radu, Ilie
Vahaplar, Kadir;  Vahaplar, Kadir
Stamm, Christian;  Kirilyuk, Andrei
Kachel, Torsten;  Rasing, Theo
Pontius, Niko;  Kimel, Alexey, Radboud Univ Nijmegen, Inst Mol Mat, NL-6525 AJ Nijmegen, Netherlands.
Radu, Florin
Abrudan, Radu
Duerr, Hermann
Ostler, Thomas ;  Université de Liège > Département de physique > Physique des matériaux et nanostructures
Barker, Joe
Evans, Richard
Chantrell, Roy
Tsukamoto, Arata
Itoh, Akiyoshi
Kirilyuk, Andrei
Theo, Rasing
Kimel, Alexey
Betz, M.
Elezzabi, A. Y.
Song, J. J.
Tsen, K. T.
More authors (11 more) Less
Title :
Ultrafast Magnetism as Seen by X-rays
Publication date :
2012
Event name :
SPIE
Event organizer :
SPIE; Femtolasers, Inc
Event date :
2012
Audience :
International
Main work title :
ULTRAFAST PHENOMENA AND NANOPHOTONICS XVI
Publisher :
SPIE-INT SOC OPTICAL ENGINEERING, BELLINGHAM, United States - Washington
ISBN/EAN :
978-0-8194-8903-6
Collection name :
Proceedings of SPIE
Commentary :
8260 Conference on Ultrafast Phenomena and Nanophotonics XVI, San Francisco CA, JAN 22-25, 2012 Proceedings Paper 0277-786X
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