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  Time-resolved imaging of domain pattern destruction and recovery via nonequilibrium magnetization states

Wessels, P., Ewald, J., Wieland, M., Nisius, T., Vogel, A., Viefhaus, J., et al. (2014). Time-resolved imaging of domain pattern destruction and recovery via nonequilibrium magnetization states. Physical Review B, 90(18): 184417. doi:10.1103/PhysRevB.90.184417.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-C168-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1A0C-5
Genre: Journal Article

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PhysRevB.90.184417.pdf (Publisher version), 3MB
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https://dx.doi.org/10.1103/PhysRevB.90.184417 (Publisher version)
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 Creators:
Wessels, Philipp1, 2, Author
Ewald, Johannes3, Author
Wieland, Marek1, 2, Author
Nisius, Thomas3, Author
Vogel, Andreas4, Author
Viefhaus, Jens5, Author
Meier, Guido1, 4, 6, 7, Author              
Wilhein, Thomas3, Author
Drescher, Markus1, 2, Author
Affiliations:
1The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
2Institut für Experimentalphysik, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany, ou_persistent22              
3Institute for X-Optics, University of Applied Sciences Koblenz, RheinAhrCampus, Joseph-Rovan-Allee 2, 53424 Remagen, Germany, ou_persistent22              
4Institut für Angewandte Physik, University of Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany, ou_persistent22              
5Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany, ou_persistent22              
6Ultrafast Electronics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074323              
7Dynamics 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: PACS numbers: 75.78.Fg, 78.47.da, 75.70.Kw, 68.37.Yz
 Abstract: The destruction and formation of equilibrium multidomain patterns in permalloy (Ni80Fe20) microsquares has been captured using pump-probe x-ray magnetic circular dichroism (XMCD) spectromicroscopy at a new full-field magnetic transmission soft x-ray microscopy endstation with subnanosecond time resolution. The movie sequences show the dynamic magnetization response to intense Oersted field pulses of approximately 200-ps root mean square (rms) duration and the magnetization reorganization to the ground-state domain configuration. The measurements display how a vortex flux-closure magnetization distribution emerges out of a nonequilibrium uniform single-domain state. During the destruction of the initial vortex pattern, we have traced the motion of the central vortex core that is ejected out of the microsquare at high velocities exceeding 1 km/s. A reproducible recovery into a defined final vortex state with stable chirality and polarity could be achieved. Using an additional external bias field, the transient reversal of the square magnetization direction could be monitored and consistently reproduced by micromagnetic simulations.

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Language(s): eng - English
 Dates: 2014-10-232014-09-032014-11-172014-11-01
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: BibTex Citekey: Wessels2014
DOI: 10.1103/PhysRevB.90.184417
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 90 (18) Sequence Number: 184417 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008