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  Direct observation of isolated Damon-Eshbach and backward volume spin-wave packets in ferromagnetic microstripes

Wessels, P., Vogel, A., Tödt, J.-N., Wieland, M., Meier, G., & Drescher, M. (2016). Direct observation of isolated Damon-Eshbach and backward volume spin-wave packets in ferromagnetic microstripes. Scientific Reports, 6: 22117. doi:10.1038/srep22117.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-C689-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-C68A-F
Genre: Journal Article

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 Creators:
Wessels, Philipp1, 2, Author
Vogel, Andreas3, Author
Tödt, Jan-Niklas3, Author
Wieland, Marek1, 4, Author
Meier, Guido1, 3, 5, 6, Author              
Drescher, Markus1, 2, 4, Author
Affiliations:
1The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
2Center for Optical Quantum Technologies (ZOQ), University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
3Institut für Nanostruktur- und Festkörperphysik (INF), University of Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany, ou_persistent22              
4Institut für Experimentalphysik, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
5Ultrafast Electronics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074323              
6Dynamics and Transport in Nanostructures, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074319              

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Free keywords: Applied physics; Ferromagnetism; Imaging and sensing; Metamaterials; Spintronics
 Abstract: The analysis of isolated spin-wave packets is crucial for the understanding of magnetic transport phenomena and is particularly interesting for applications in spintronic and magnonic devices, where isolated spin-wave packets implement an information processing scheme with negligible residual heat loss. We have captured microscale magnetization dynamics of single spin-wave packets in metallic ferromagnets in space and time. Using an optically driven high-current picosecond pulse source in combination with time-resolved scanning Kerr microscopy probed by femtosecond laser pulses, we demonstrate phase-sensitive real-space observation of spin-wave packets in confined permalloy (Ni80Fe20) microstripes. Impulsive excitation permits extraction of the dynamical parameters, i.e. phase- and group velocities, frequencies and wave vectors. In addition to well-established Damon-Eshbach modes our study reveals waves with counterpropagating group- and phase-velocities. Such unusual spin-wave motion is expected for backward volume modes where the phase fronts approach the excitation volume rather than emerging out of it due to the negative slope of the dispersion relation. These modes are difficult to excite and observe directly but feature analogies to negative refractive index materials, thus enabling model studies of wave propagation inside metamaterials.

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Language(s): eng - English
 Dates: 2015-11-062016-02-082016-02-24
 Publication Status: Published online
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/srep22117
 Degree: -

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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 22117 Start / End Page: - Identifier: Other: 2045-2322
CoNE: /journals/resource/2045-2322