Journal Article

PreJuSER-7543

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ultrafast demagnetization dynamics at the M edges of magnetic elements observed using a tabletop high-harmonic soft X-ray source

La-O-Vorakiat, C. ; Siemens, M. ; Murnane, M. M. ; Kapteyn, H. C. ; Mathias, S. ; Aelischmann, M. ; Grychtol, P.FZJ* ; Adam, R.FZJ* ; Schneider, C. M.FZJ* ; Shaw, J. M. ; Nembach, H. ; Silva, T. J.

2009
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7227  doi:10.1103/PhysRevLett.103.257402

Abstract: We use few-femtosecond soft x-ray pulses from high-harmonic generation to extract element-specific demagnetization dynamics and hysteresis loops of a compound material for the first time. Using a geometry where high-harmonic beams are reflected from a magnetized Permalloy grating, large changes in the reflected intensity of up to 6% at the M absorption edges of Fe and Ni are observed when the magnetization is reversed. A short pump pulse is used to destroy the magnetic alignment, which allows us to measure the fastest, elementally specific demagnetization dynamics, with 55 fs time resolution. The use of high harmonics for probing magnetic materials promises to combine nanometer spatial resolution, elemental specificity, and femtosecond-to-attosecond time resolution, making it possible to address important fundamental questions in magnetism.

Keyword(s): J

Note: The authors gratefully acknowledge funding from the U.S. Department of Energy and the NSSEFF program. This research used facilities provided by the NSF Engineering Research Center in EUV Science and Technology. Contribution of the National Institute of Standards and Technology, an agency of the U.S. government, not subject to U.S. copyright. We also acknowledge useful discussions with D. Steil and M. Cinchetti.

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Contributing Institute(s):

1. Elektronische Eigenschaften (IFF-9)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2009

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